Continuity mistake: During the "Party in the U.S.A" scene on the bus, in one shot Jessica sits down, but a fraction of a second later in the next shot she is standing and proceeds to sit down again. (01:10:05)
Continuity mistake: After the first Bellas' rehearsal Aubrey is about to flip over the whiteboard with the "Choreography" layout. In the very next shot she is flipping over the whiteboard/chalkboard that has the "Road to Victory" flowchart on it. (00:38:55)
Continuity mistake: After the Bellas' first rehearsal when Aubrey asks to have a word with Beca, Beca's hair over her left ear changes positions (from covering her ear to being placed behind it) virtually every other shot. (00:38:10)
Continuity mistake: During the scene when Jesse is putting the album covers in front of his face to make Beca laugh while they are re-shelving in the radio studio, Beca starts to move to her left after Jesse lowers the Adam Lambert album. In the next shot she is moving to her right. (00:41:10)
Continuity mistake: The extras directly behind Chloe and Aubrey in the auditioning scene keep changing or disappearing, especially when Beca arrives.
Continuity mistake: At the very start of the film when Bumper is telling the Bellas that they are "awesome-ly horrible, I hate you, kill yourselves, sisters before misters," one of the members from the Trebles walking off stage behind him walks by twice in the same direction.
Continuity mistake: In the bus scene where the Bellas run out of gas, the gas gauge in the close up is empty in the top right. A few seconds later, the gauge is half full. (01:10:25)
Answer: It wasn't just that she sang a song he likes, she sang arguably the most well-known song from his favorite film in front of a huge crowd of people. It was a public, heartfelt apology rather than the abrupt, private apology she gave earlier.
BaconIsMyBFF