These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Girl Who Leapt Through Time
Adaptation Displacement: It's an "adaptation" of a Japanese novel that it's actually more of a loosely-connected sequel to. Notably, the author of the original work loved this movie and said that it was perfect as a "unique sequel."
Crowning Music of Awesome: "Kawaranai Mono" by Hanako Oku—played when Makoto realizes she has one time leap left and knows she can help Chiaki. She rushes out of her house and makes three leaps as she heads back in time while seeing memories of when Kousuke and she first met Chiaki and developed their friendship.
Plus, the scene where she runs to find Chiaki, panting the entire time, seems to last for ages.
Shocking Swerve: Well, to several viewers/reviewers at any rate, the last forty minutes were just slightly out of left field. Up until that point, it followed pretty much every convention of a girl's coming-of-age anime, until Chiaki reveals he's from the future. When you're expecting the typically-unexplained magic power that ends in a lesson about responsibility and with status quo being God, it's a bit unexpected.
Rewatch Bonus: First time you watch the film this is true, but if you watch the film again, there are hints and subtle foreshadowing that Chiaki knows about time traveling, you just don't pick up on them first time round.
Values Dissonance: A number of Japanese reviewers on Amazon HATE Makoto for swapping in her classmate in home ec and making him the target of bullies, thereby probably dooming him for life. And not even feeling sorry for it or trying to change it (although presumably it is undone along with all of her other changes during the final time leap). This point, along with her eliminating her friend's relationship with Chiaki, is almost never brought up by Western audiences.
Because Chiaki steps in front of Makoto to shield her from an incoming fire extingusher and gets injured, Makoto uses a time leap to push him out of the way. However, this time around it's Yuri who gets injured.