Heartwarming / 50 First Dates

• "Wouldn't It Be Nice" by The Beach Boys, which serves as a sort of theme for Lucy, is one of Brian Wilson's most beautiful compositions. A closer look at the lyrics shows that they line up pretty closely to Lucy and Henry's actual love story in the movie.
• Lucy and Henry marry and have a kid together.
• "Forgetful Lucy"
• 311's gorgeous reggae'd-up cover of The Cure's "Lovesong" on the soundtrack.
• All the things Marlin and Doug do for Lucy every night. To the point of watching the same football game and The Sixth Sense, washing her shirt, refilling her shampoo, painting the workship white, and having a pineapple upside down cake. And they've been doing it for over a year. All because they love her and want her to have a nice day.
• The entire premise is a Discussed Trope; Henry and Lucy are explaining Lucy's condition to a couple at a party... and the woman is pregnant.
  Woman: So every day you help her to realize what happened... and you wait patiently for her to be okay with it... then get her to fall in love with you again?
  Henry: Yes, ma'am.
  Beat
  Woman: [hits her boyfriend] You asshole! You don't even open the fricking car door for me anymore!
• In a sense, the fact that Lucy is never outright "cured" of her condition. Most movies of this ilk might have some happenstance completely cure Lucy of her amnesia so she and Henry can go on to live a normal life free of these prior issues. But not this movie. Lucy and Henry work together day by day, taking steps and making concessions in their relationship to let Lucy be comfortable despite her memory loss erasing most of her memories with her and Henry. For people who have terminal conditions or illnesses that they've lived with their whole lives, this can be a sweet thing all on its own. The idea that one can find a partner who loves them so much that they want to work with them to live together despite the fact it may be more difficult than if they were with someone completely healthy.
• Sue, the owner of the cafe, is something of a Mama Bear towards Lucy. She tries to stop Henry from talking to her and explains Lucy's memory problems to him when she doesn't remember him. In the first video Henry makes for Lucy there's a clip of Sue where she reveals she was friends with Lucy's late mother and promised to watch out for her friend's daughter.
• When the doctor asks Henry if his head had always been egg-shaped before being hit with a bat, Doug loudly retorts "hey, don't make fun of Henry like that! It’s not his fault his head is shaped that way!" While his aggression is likely a result of steroids, it's still heartwarming to see that he has come to accept Henry and will jump to his defense like that.
• Henry going to see Lucy at the institute where he learns Lucy has been seeing him in her dreams every night and painting pictures of him every day.
  Lucy: I don't know who you are, Henry... but I dream about you almost every night. Why?
  Henry: What would you say if I told you that notebook you read every day used to have a lot of stuff about me in it?
  Lucy: I would say that that makes a lot of sense.
  Henry: You erased me from your memories because you thought you were holding me back from having a full and happy life. But you made a mistake. Being with you is the only way I could have a full and happy life. You're the girl of my dreams... and apparently, I'm the man of yours.