Audio problem: In the opening scene the camera shows a close up of "Bumper singing please don't stop the" (repeatedly) then pans to the Bellas off stage. His singing doesn't match the audio. In fact several times during that performance there is audio of him singing but his mouth is not moving. (00:01:30)
Continuity mistake: When Benji and Jesse are approaching the Treblemakers at the activities fair, and the Treblemakers begin singing "Whip It," The Treblemaker in a blue shirt goes from the steps on the left to the wall on the right between shots, and is back on the steps when we see Aubrey and Chloe watching them. (00:09:50)
Continuity mistake: Extra walks past Benji and Jesse twice as they are observing the TrebleMakers, he is easy to spot seeing as he's a fat kid in a brown shirt with black trousers and a backpack. 1st camera angle change is slick but he walks past again seconds later. (00:14:45)
Character mistake: At the activities fair, after Benji and Jesse walk away from the Treblemakers, Bumper says "Let's match pitch." Then sings a note. The rest of the Treblemakers harmonize, rather than match the note that Bumper sings. (00:15:40)
Continuity mistake: When Beca walks into the radio station at the beginning it says 85.7 on the window but when she walks into the studio the guy inside says 95.7 WBUJ over the tannoy. (00:15:50)
Continuity mistake: In the scene where Beca and Jesse are in the radio station for the first time, Beca's hair changes from pulled behind her ear to loose between shots. (00:17:25)
Continuity mistake: In the scene where Beca's dad wakes her up for her class her desktop is "awake" (showing her home screen). A few shots later Beca's dad walk towards it and the desktop is on its screensaver then gets bumped to awake. If the screensaver was set to activate after a period of inactivity, it would already have kicked in while Becca slept, not in the short time it's offscreen. (00:18:30)
Character mistake: When Aubrey is telling the Bellas that they will practice two hours a day, seven days a week, the board behind her states that on Sundays they have the day off. (00:35:05)
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: 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: 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 water bottle to Fat Amy's right on the floor is present in 1 shot and next shot it is moved behind her much farther away. (00:54:10)
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: 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)
Continuity mistake: During the finals, Cynthia Rose's blazer is done up, but during the next shot, it's undone, then the next shot shows it's done up. (01:40:05)
Continuity mistake: Towards the end, when Beca and Jesse kiss, there is a gap of 2-3 seats between Jesse and Donald, even though they were sitting next to each other during the Bellas' performance. (01:41:00 - 01:44:00)
Continuity mistake: In the scene where Beca is going to do night shift at the radio station,when she is unlocking the door to the radio station she has a handbag on her shoulder but when she enters the booth in the radio station she has a backpack on her back instead of a handbag.
Character mistake: In the scene where Becca and Jesse have a picnic, she tells Jesse that she knew Darth Vader was Luke's father, because "Vader literally means father in German." This is incorrect. However, it does mean father in Dutch. The German word for father is Vater.
Visible crew/equipment: During the Finals of the International Championships at the end of the movie. Beca is singing "Don't you forget about me" the camera cuts to Jesse sitting in the crowd with Donald sitting next to him, in a few of these shots, you can see crew in the reflection off Donald's glasses and an empty stage.
Other mistake: Before the nationals, when Beca is getting dressed, we see in the mirror that Kimmy-jin is playing KINECT Sports, but when it pans to her, she is playing with a controller.
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