Continuity mistake: In the scene where all the groups are together and having a party, Donald changes position several times. First he is standing next to Bumper and in the next shot he is dancing, the shot after he is again standing next to Bumper.
Continuity mistake: In the very beginning scene when the Treblemakers are singing "Please Don't Stop the Music", they do not have on sunglasses, then it goes to the commentators. When it goes back to the Trebles, they are wearing sunglasses, then a few seconds later they aren't again.
Continuity mistake: In the picnic scene, there is one extra in the background with a blue shirt and jean shorts that walks by three times.
Continuity mistake: When the Bellas are performing at the frat party, Chloe briefly turns her head to show that her hair is in an elaborate updo. In the scene immediately following that scene, Chloe's hairstyle changes to a bun pinned to the back of her head.
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 Beca arrives during the fight scene you can see Denise behind Fat Amy and Chloe moved to approach Lily twice in between scenes.
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)
Continuity mistake: During the shower scene where Beca and Chloe song Titanium, Beca begins the shower wearing gauged spike earrings but when Chloe startles her they are regular silver earrings and they remain that way for the rest of the scene.
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)
Factual error: In the scene where the Bellas run out of gas, on their way to the second competition, it shows the gas gauge saying "unleaded fuel only." But when the bus runs out of gas it makes the sound that a diesel engine makes, not a regular gas engine.
Suggested correction: It's possible that different vehicles sound different.
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)
