Audio problem: After John and Ted's falling out, Ted comes and knocks on the glass doors. The sound is of a knock which would be impossible since Ted's hands are made of material.
Suggested correction: Ted's legs can also support his body and he's able to drive, etc, despite being made out of cotton. He's a magic wish that came true and can knock.
Audio problem: When the alien cuts Boris's shackles they hit the floor and make a metallic sound, yet when the chest armour falls it sounds like the foam object it really is made of. (00:03:40)
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)
Audio problem: All of Francois Fromage's audio sounds completely off. There is an unnatural echo in his voice, as if the audio was not mixed properly during post-production. (00:49:55)
Audio problem: During the escape from Monte Carlo they all drive a van off a roof to land on the roof of the Hotel Ambassador. Captain DuBois drives her bike of the same roof to catch them. While she is in airborne she jumps off her bike onto the roof of the Hotel Ambassador and the bike falls to the ground. Yet we don't even hear the bike landing on the ground at no point despite the fall only taking a few moments. (00:17:35)
Audio problem: In the scene where Tommy Lee Jones and Meryl Streep are going into the therapist's office for their first appointment, which is scheduled to be at 10:30 am, bells are chiming in the background that indicate the time is actually at the top of the hour.
Audio problem: When Dave (Dylan O'Brien) and Aubrey (Britt Robertson) Are walking to her house after they first met at the party they are filming from a wide shot and you can hear both characters talking but their mouths are not moving.