Anguished Declaration of Love: Played with; she doesn't say it outright, but Olivia makes it clear to Wen that her feelings for him are the reason she's with Lemonade Mouth.
Asian Airhead: Blown all the way to hell and back by Stella, who is visionary, leader and driving force of not only Lemonade Mouth, but in the effort to give the students a voice, and the one who gets Mel to build the music hall for the school.
Berserk Button: Doing anything that defaces the school, or the new gym, will put you in hock with the principal, whether you did it or not. (See the "Lemonade Mouth banner" incident in the cafeteria.) Also, "a school dance is no place for a political tirade."
Cool Loser: The members of Lemonade Mouth, especially Stella.
Cute Kitten: Wen gets Olivia a kitten to replace her pet cat.
Dark Horse Victory: Played with, as Lemonade Mouth doesn't win at Rising Star (or even play) but ends up becoming a successful band that plays Madison Square Garden.
Determinator: Stella embodies this trope; inverted in that Olivia has to be coaxed by the others in order to do everything. Hilarious in Hindsight when you consider that Olivia wrote "Determinate".
All of them when they attempt to sing even while the main vocalists have sicknesses. Again, consider the song they were singing.
Example: Movie!Charlie's big brother is away at college for most of the film. In the book, he's Charlie's twin and died in childbirth with the umbilical cord around his neck.
Earn Your Happy Ending: So much so, that this could also be a secondary theme of the film.
Elaborate University High: A plot point in both book and movie, the latter was shot on location in several with Ms. Resnik's actress commenting that she'd never seen such nice high schools before coming to Albuquerque.
Establishing Character Moment: the scene where the kids sing "Turn Up the Music" neatly defines the members of Lemonade Mouth and their personalities.
Expy: Lemonade Mouth themselves are expies of the detention gang from The Breakfast Club, especially Charlie and Wen.
Stella and Mo come across as Spear Counterparts to John Bender and Brian Johnson, while Olivia seems very much a Deconstruction of Claire Standish, and Charlie and Wen are inversions of Andrew Clarke and Allison Reynolds.
Stella also is quite similar to Stevie only without magic and less sociopathic, as well as musically inclined.
Stella's Brother: When did you become a vegetarian? Stella's Dad: Yeah, uh, when did this happen? Stella:(looks down at shirt reading "Vegetarians Rock!") ...four months ago?
Fanservice Pack: Mo's outfits whenever she's on stage (or away from her Overprotective Dad); the entire band at Madison Square Garden. Averted by Scott, as he's always dressed that way.
Five-Man Band: Played with like a ball of yarn by Olivia's new kitten.
The Hero - Olivia is the lead singer, but she acts more like the The Lancer.
The Lancer - Stella is lead guitar, so you'd think she'd be this, but she acts like The Hero.
The Smart Guy - Wen looks like this at first, and he does play keyboard, but he's more The Big Guy.
The Big Guy - Charlie would be this, since he's the drummer, but his role is closer to The Chick.
The Chick - Mo would be, if she didn't play bass and acted more like The Smart Guy. Unfortunately, she isn't enough of The Smart Guy to satisfy her parents.
The Sixth Ranger - Scott, after he tries to help the band out at the Rising Stars competition.
Held Gaze: Happens between Wen and Olivia while writing 'Determinate'. They then go back to awkwardly writing the song.
Heroes Want Redheads: Olivia's attraction towards Wen; it really shows when he comes over to Olivia's house and she shows him her songs, and when she admits that he's the only reason she even got involved with the band.
Heroic BSOD: Olivia suffers this on stage at Rising Star (arguably, it's the entire band that does), and has one averted just before their first performance.
Insult Backfire: Ray calls Stella 'lemonade mouth' after she stops a fight between him and Charlie by spitting a mouthful of lemonade into his face. That's how the band got its name.
Ironic Echo: When Scott finds out that Mo is in Lemonade Mouth, he tells her that if she wants to be in a band, she can play backup guitar for him (in Mudslide Crush). Fast forward to the last line of the film, when Olivia says that she hopes their new guitar player (Scott) can keep up... and we see Scott playing backup guitar for them.
The Power of Friendship: This trope is what keeps the band going, as evidenced by the song "More Than A Band".
The Power of Rock: The secondary message of the film - that a good rock band can change the world.
Which could be a incidental Shout Out to Macross 7's Fire Bomber, which did the same thing.
Pretty Fly for a White Guy: Played with, as aside from the rapping, Wen comes across as a normal, average suburban kid with average problems. Also played with in the case of Stella, in that while she wants to be special and an individual, she also wants her family to love and accept her, regardless of what she's into or does.
Redemption in the Rain: Inverted. The band's lowest point, - getting arrested and losing the lemonade machine at the same time - comes during a rainstorm.
Confirmed by Word Of God that the song was modified to better reflect Mo and Scott's relationship.
The Runner Up Takes It All: Olivia says that they didn't won Raising Star, the last scene of the movie shows them playing at Maddison Square Garden.
Screw the Rules, I Have Connections!: Directly stated as to how Scott gets off with just a warning when he and Mo sneak off, while she gets detention. Implied as to how the popular students get away with so much.
Serious Business: Do not mess with the lemonade machine. However, some fans would note that most of their annoyance has to do with the fact that the machine is being removed to further the principals favoritism of the jocks over other students, which is a legitimate thing to take seriously. Also, as far as the principal is concerned, do not step out of line.