- Arnold's friends put together a video showcasing why Arnold deserves to go to San Lorenzo (it's for a contest sponsored by a humanitarian organization). Framed as one of Gerald's urban legend tellings, the video showcases everyone he's ever helped over the show from Stoop Kid, Dino Spumoni, and Pigeon Man (yes Arnold's classmates even tracked him down) to explain how Arnold helped them and how much they appreciate him for it. And the class wins the trip.Stoop Kid: Because of Arnold, now I can harass people from my stoop and from off my stoop. (laughs maniacally) But seriously, that guy has a great heart.
Dino Spimoni: I get applause from fans, but Arnold's the real star.
Patty: Arnold listened to me and treated me like another friend. He's, you know, pure of heart.
Gerald: (closing the video) "Pure of heart." That's Arnold and that's why he deserves to win the trip to San Lorenzo. Cause he's done so much for others. He's a humanitarian just like his parents and the Helpers for Humanity. Hey Arnold, you're a bold kid and a true hero.
- The sheer amount of The Bus Came Back. Apart from Pigeon Man, we also see Curly (who evidently wasn't hacked to pieces by the Ghost Bride), Monkey Man, Lockjaw the turtle, Tucker Wittenburg, Mai Hyuhn and Iggy.
- Wolfgang is among the crowd giving Arnold their support. Evidently, he does care for our beloved football-head. That, or he possibly made-up with Arnold and friends sometime before this. Either way, it's nice to see him supporting Arnold.
- You can see Harold talking to the lady who owned the kitten from "Harold's Kitty" at the party, showing that they are still good friends after all this time.
- A small one, but the fact that Sid doesn't take part in Harold and Stinky's mischief in the final shot and actually tries to salvage it.
- Once the video ends, Mr. Simmons reveals that once the Helpers for Humanity saw the video, they immediately named Arnold the contest winner. Subverted when it's later revealed the whole contest was a scam by Lasombra in order to lure Arnold to San Lorenzo.
- The fact that it was Helga who made the video, and she is completely civil and nice in her conversation with Arnold. She may not admit her crush, but she has no issue showing how much she appreciates him and doesn't berate him with her usual insults. So far a great display of Character Development for her!
- Another small one: Gerald and Helga are on noticeably friendlier terms than they were in the show itself, with Gerald shrugging off most of her faux-nastiness and Helga showing concern for his well-being while accidentally setting off the Green Eyes' traps. It's strongly implied that he now knows Helga's secret and this is why he does. Even if they are dangling from a rope bridge that's hanging off a cliff, that's bound to snap at any second it's kind of sweet to see Helga clinging onto Gerald for dear life.
- In another trailer, Gerald insists on helping Arnold look for his parents and in a scene that may or may not come after their Plot-Mandated Friendship Failure, Arnold performs a Diving Save to knock Helga out of the way of an arrow.
- Brainy rescuing Helga's Arnold locket. It's clear that, though he loves Helga himself, he knows how much Arnold means to her. And how does Helga thank him? By giving him a kiss.
- A very brief moment that doubles as a meta example, but just before everyone departs for San Lorenzo, Mr. Simmons can be seen with Peter (his not-so-implied boyfriend) from "Arnold's Thanksgiving". They smile fondly at each other and then hug. It's finally confirmed ladies and gents, LGBT community rejoice. It's especially lovely considering how prickly and inconsiderate of Mr. Simmons Peter was being when we first saw him. It was a long held fan theory that he was a much more pleasant person when he didn't have to be around his boyfriend's mother, and indeed, this pretty much confirms that he adores Robert.
- Similarly, when Arnold's lamenting the fact he doesn't have his parents, you can see an interracial couple taking a picture with their biracial baby. While interracial couples are more accepted in kids media than same-sex couples are, they're still underrepresented when compared to how common they are in real life
- As the group orchestrates an escape from Lasombra's forces, Phoebe tells Gerald "See you on the other side..." before kissing him on the cheek and calling him "handsome".
- When Arnold looks back at his friends, clearly still feeling bad about the ordeal, Phoebe gives him a thumbs up to assure him that everything is okay.
- Helga revealing her Arnold locket to the others, so that they can use it as a replacement for the lost Corazon.
- Once Arnold activates the machine that spreads the sleeping sickness cure, all the Green Eye children's parents begin to wake up and they're happily reunited with their kids. Arnold then runs to his parents' room and sees that they're waking up as well. They look over towards him and instantly recognize him even though he was a baby the last time they saw him. Arnold begins to tear up and he runs over and hugs his parents for the first time in nearly a decade.
- The Big Damn Kiss and everything leading up to it, it was fifteen years in the making and well worth waiting for. Helga is trying to get her locket out of the compartment it was put in when Arnold comes up to her and begins talking to her, telling her there were times over the years that he did wonder whether she was actually in love with him. He admits that she did confess both in the first movie and earlier in this one but he wasnt ready but considering all she did for him throughout the movie... and then kisses her.
- The ending. We get a Bait-and-Switch that at first seems to be implying that the whole movie was just a dream...but then Arnold's parents arrive through the kitchen door with breakfast and after some heartfelt family bonding, Arnold heads to school. He and Gerald bump into (for once, not literally) Phoebe and Helga, prompting Gerald and Phoebe to immediately walk to school together while holding hands and Arnold offering to do the same with Helga (which she swoons over and then refuses, in true Helga fashion). Then Arnold's parents show up telling him that they want to walk him to school—as he heads in, they assure him that they'll be right outside waiting for him, to which he smiles. It's even amazing how the ending averts Stranger in a Familiar Land for Miles and Stella. Instead of being unfamiliar with their home or their fellow neighbors or their typical everyday lives, they take it like fish to water. Despite being asleep for a decade in San Lorenzo, Hillwood is their true home.
- A special tribute is given to the fandom during the credits:Thank you to all the fans who wrote letters and signed petitions encouraging the making of this movie.
Heartwarming / Hey Arnold! The Jungle Movie