Harry Potter remains one of the most popular and beloved sagas, but many fans agree that the movie adaptations of the book series left many storylines out. This was mostly due to time constraints as well as the difficulty of translating details from the book to the screen, and because a few scenes or characters were too expensive to produce, such as the many house elves or Peeves the Poltergeist. For these reasons, there are a lot of details and storylines from the books that fans who've only seen the movies probably don't know about. And this is especially true in the case of Harry Potter and the Deathly Hallows, where, even though the movie adaptation was split into two parts, there were many storylines left off the screen.

Harry Potter and the Deathly Hallows marks the end of the fantasy saga and the end of Harry's journey to defeat Voldemort. As such, multiple storylines had been introduced throughout the previous six books, and they needed to find a resolution in the final Harry Potter book. But it would've been impossible to include everything in the movie adaptations of the seventh Harry Potter book, so many storylines were left out in favor of more battle scenes and stories that only concerned the Golden Trio: Harry, Ron and Hermione. However, even if these storylines were left out of the movies, they were still major parts of the Harry Potter and the Deathly Hallows book.

Dudley and Harry's goodbye at the beginning of Harry Potter and the Deathly Hallows might feel like a small moment in the saga, but it's a major character development moment for Dudley. Dudley Dursley, Vernon and Petunia's son and Harry's cousin, had always been an antagonistic character, bullying Harry from a very young age. But in Harry Potter and the Order of the Phoenix, things change between them after Harry saves Dudley's life when they run into Dementors in Little Whinging.

Even though Muggles can't see Dementors, they can feel and suffer the effects of these dark creatures that suck all the joy and hope out of their victims. Dudley wasn't the same after the Dementor's attack, and in Harry Potter and the Deathly Hallows, Dudley proves just how grateful he is that Harry saved his life. Their goodbye is awkward as neither of them knows exactly how to make amends to be friendly after so many years of actively hating each other, but it's a moment that's important for the story, and to see that Harry at least has someone in his family who doesn't despise him after all. A version of this scene was filmed for the first part of the Harry Potter and the Deathly Hallows movie, but it was eventually cut.

Harry Potter and the Prisoner of Azkaban brought Harry's father into the spotlight, as the story delved into James Potter's past and his friendship with Sirius Black, Remus Lupin, and Peter Pettigrew. Everyone believed at first that Sirius Black had betrayed James and Lily Potter and had given their location to Voldemort, but Prisoner of Azkaban reveals that it was actually Peter Pettigrew who betrayed the Potters. Sirius and Remus want to kill Peter right then and there, but Harry decides to save Pettigrew's life and instead turn him in.

However, things sadly go horribly wrong, and Peter escapes, eventually joining Voldemort and becoming a major player in Voldemort's return to power. Harry and Peter Pettigrew come face to face again in Harry Potter and the Deathly Hallows when Harry and the others are captured and held at Malfoy Manor. And when Harry and Ron try to escape, Peter tries to stop them, but hesitates only for a second, remembering that Harry saved his life. Peter's indecision was enough to cost him his life, and the silver hand that Voldemort gave Peter turned against him, choking Peter to death.

Kreacher is the Black's House-elf, who spent many years alone at Grimmauld Place, taking orders from a painting of Sirius' mother. Kreacher, much like Mrs. Black, despised Muggles and Muggle-borns, and was particularly hateful towards Sirius Black and everyone from the Order of the Phoenix. However, Kreacher's story in Harry Potter and the Deathly Hallows is one of the most tragic and heartbreaking, and helps explain some of his actions.

Sirius' brother Regulus offered Kreacher to Voldemort when Voldemort needed a House-elf, without knowing that Voldemort would use Kreacher to test the defenses around the cave where he kept one of his Horcruxes, Slytherin's Locket. Kreacher had to endure all the horrible pain and suffering from the cave's protections while Voldemort simply watched and laughed, and then Kreacher was left in the cave to die. Luckily, Regulus called Kreacher back, and Kreacher was able to return home, but the horrible things he went through made Kreacher one of the most tragic characters in the Harry Potter saga.

Phineas Nigellus Black was a Hogwarts Professor who later became a Headmaster and was part of Sirius Black's family. There's a portrait of Phineas Nigellus in the Headmaster's office at Hogwarts, and another at Grimmauld Place. In Harry Potter and the Order of the Phoenix, Dumbledore uses Phineas Nigellus' portrait to communicate with Grimmauld Place from his Headmaster's office.

After Harry, Ron and Hermione had to leave Grimmauld Place in Harry Potter and the Deathly Hallows, they took Phineas Nigellus' portrait with them in Hermione's bag. Phineas Nigellus' portrait plays a major role in the books, as it is thanks to him that Snape finds out that Harry is hiding in the Forest of Dean and is able to give Harry the Sword of Gryffindor. Phineas Nigellus' portrait also gave the Golden Trio small snippets of what was going on at Hogwarts during their time on the run, and helped Snape keep an eye on Harry, Ron and Hermione.

Harry Potter and the Deathly Hallows sees Harry learning a lot about Snape's past through Snape's memories after Voldemort kills Snape. And in many of these memories, Harry also sees his mother as a young girl, as Snape and Lily met before going to Hogwarts. Petunia, Lily's sister, is also in some of Snape's memories, and these moments with Petunia give a rare glimpse into what it was really like between Petunia and Lily when they were younger, and how Petunia's jealousy shaped who she became as an adult.

Petunia has always been very vocal about her dislike of her sister and everything to do with the wizarding world. But as a young child, she wasn't as adamant about her hatred for the magical world. Instead, Petunia even tried to get into Hogwarts and sent a letter to the wizarding school, only to be rejected. As a child, this rejection and the jealousy she felt seeing Lily going to Hogwarts while she couldn't, completely shaped Petunia's future and explains most of her actions and character as an adult.

Albus Dumbledore is one of the most important characters in the Harry Potter saga, the de facto leader of the resistance against Voldemort, as he was one of the most powerful wizards of all time. And as such, he was also the one who guided Harry through his journey and destiny to defeat Voldemort. But while Dumbledore seems like one of the best and most well-liked characters in the saga, the Harry Potter and the Deathly Hallows book sheds light on Dumbledore's past, turning him into a complex and morally gray character.

Dumbledore's past is probably one of the most interesting stories in Harry Potter and the Deathly Hallows. Harry learns about Dumbledore's family and his teenage years, and how Dumbledore became friends with one of the darkest wizards of all time, Gellert Grindelwald. A lot more about Dumbledore's past, such as what happened to his parents and to his sister Ariana, as well as Albus' own search for the Deathly Hallows and his struggle with power, play a major role in the Harry Potter and the Deathly Hallows book.

Potterwatch is probably not a major storyline for many, but it was a detail that helped contextualize the height of the Second Wizarding War. Potterwatch was a clandestine radio show hosted by the Weasley twins' best friend, Lee Jordan, in Harry Potter and the Deathly Hallows. This radio show was one of the many shows of defiance against Voldemort and his Death Eaters, and added a dose of realism to the story.

Potterwatch kept allies up to date with events that weren't reported in the official news, such as the Daily Prophet, as those had fallen under Voldemort's influence. Potterwatch also helped maintain the morale and the sense of rebellion among those fighting against Voldemort. Harry, Ron and Hermione eventually learn about Potterwatch and use the radio show to keep up with what was going on in the wizarding war during their time on the run.

Lupin and Tonks' relationship doesn't get much of a spotlight in the Harry Potter movies, and this is particularly evident in Harry Potter and the Deathly Hallows. In Harry Potter's final book, Lupin and Tonks become parents to Teddy Lupin, a storyline that even gives Lupin a powerful story arc. Lupin is worried that he might be a bad father, or that his son will have werewolf qualities, and even volunteers to go with Harry, Ron and Hermione on the run due to his fear of becoming a parent.

Luckily, Harry steps up and forces Lupin to stay and face his own fears. This, in turn, shapes their relationship, and once Teddy Lupin is born, Lupin asks Harry to be Teddy's godfather. Lupin and Tonks tragically die during the Battle of Hogwarts, and while the Deathly Hallows movie briefly mentions Lupin's son after Lupin's death, for those who've never read the book, it probably felt like the revelation came out of nowhere.

Percy Weasley's story is a major part of the Harry Potter books, but the movies barely mention him after Percy graduates from Hogwarts. In the books, Percy sides with the Ministry in Harry Potter and the Order of the Phoenix, denying Voldemort's return and questioning Harry and Dumbledore's sanity. This causes Percy to also shun his own family, as the rest of the Weasleys side with Dumbledore and Harry.

Percy continues to have a strained relationship with his family in Harry Potter and the Deathly Hallows, even missing his own brother's wedding. Even though there's no way to deny Voldemort's return now, Percy's ego and pride stop him from reconnecting with his family, something that the Weasleys struggle with, Molly in particular. However, Percy eventually comes to his senses and accepts his mistakes as he joins the Weasleys during the Battle of Hogwarts and fights alongside them.

Probably one of the biggest storylines in Harry Potter and the Deathly Hallows that was completely changed in the movie adaptation is what happens to the Elder Wand. In the final Harry Potter movie, Harry, Ron and Hermione stand on a bridge and Harry decides to throw away the Elder Wand. However, he never fixes his own wand beforehand, leaving Harry without any wand at all.

In the Harry Potter and the Deathly Hallows book, Harry realizes that he is the master of the Elder Wand, but he doesn't want it. Instead, he talks to Dumbledore's portrait and explains that he will leave the Elder Wand in Dumbledore's grave, hoping that if he dies from natural causes, the Elder Wand's power will die with him. But before leaving the Elder Wand, he uses it to fix his own Phoenix-core wand, a wand that saw Harry through some of the most dangerous moments of his life, and that Harry felt a strong affinity to.