Audio problem: When Susan is playing the guitar, it has an electric guitar sound. Susan is not playing an electric guitar and neither is Hecky so the guitar should not sound like that.
Audio problem: Every time Sly laughs, it sounds exactly the same, don't you think they could have recorded more than one laugh?
Audio problem: Lorraine comes to see Marty in Doc's garage in 1955 to ask him if he will go to the dance with her. Just before Lorraine moves to the other side of the car from where she walked in, she begins to say something to Marty. The problem is that her lips don't move when she talks, I guess the right clip ended up on the editing room floor. (01:11:40)
Audio problem: In the scene where the birds have a party, Pedro and Nico sing "I Wanna Party". If you look at his lips he sings "My life" but he just smiles.
Audio problem: In the song "I'm Getting Married in the Morning" Alfred steps on the pianist's hand. After this, is the piano keys he hits aren't the same as what we hear.
Audio problem: When Richie goes in place of his father to open the tool warehouse, the kids playing baseball gather at the gate and the girl in the middle says something like "Are you crazy? That's Richie Rich, the richest kid in the world." After that line, watch the black kid with a baseball cap to the left of the screen. His mouth moves but there is no voice.
Audio problem: When Abby, an elf, is about to tell Santa that Charlie is on the naughty list, she says something about 'Brazilian cocoa beans'. As this line is heard, you can see that her mouth is moving completely differently from the words we hear.
Audio problem: At one point near the end of the movie, you can hear Tzeitel's baby crying. Watch closely, and you'll see that the baby's mouth is not moving. It's even closed at times.
Audio problem: When Dre is leaving Meiying's violin practice in the auditorium there is a long shot of her playing her violin showing her left side as Dre walks to the exit. The notes she is playing are vibrato - varying the pitch of the notes by rapidly pivoting the finger on the strings - but her hand is perfectly still. Even though you can only see part of her hand it is obviously that her playing style doesn't match the notes being played.
Audio problem: Early in the movie when we first meet Winnie, the audio is out of sync.
Audio problem: In the external shot of "The Orient Express Restaurant" where Daniel's mum sits down and says, "Guess what? I'm going to be training as a manager.", her mouth isn't moving at all.
Audio problem: The Rabbit leads the two main dogs past the snakes with the password. The first few words he says, his mouth isn't moving.
Audio problem: When Bugs says "There's gold in them thar hills" when he comes into the shop carrying a gigantic piece of gold, his mouth doesn't move.
Audio problem: When Pikachu has coffee cups all over Harry's office, Tim starts knocking them over. The cups make a plastic/can sound, but the cups are cardboard.
Audio problem: When the spider is attacking Wicket, Cindel screams but we can see Cindel when she screams (left hand corner when Wicket is pushed onto the floor) and her mouth isn't moving.
Audio problem: When Sandy is underwater fixing the net, Kim places the rope in Flipper's mouth and says, "Bring this to Sandy," but her mouth is not in sync with those words.
Audio problem: When the very first song ends during the Festival scene, keep an eye on the guitarist to the right. His hand is still moving but no sound is coming out of his guitar. (00:56:55)
Audio problem: When the carolers come to sing for the Kranks, it is professional-quality singing. Then the neighbors join and you can hear that more people are singing, and the quality of the singing is realistically worse(the neighbors can't sing well.) After a few shots of the carolers AND the neighbors singing, the sound goes back to just the carolers singing, though you still see the neighbors singing on screen.
Audio problem: When Bastian puts Auryn under his shirt, there's a "bling" sound like Auryn hits another piece of metal, like a medallion or necklace. However Bastian isn't wearing any other metal. (00:11:55)
Audio problem: When Kup and Hot Rod are smashing up the Sharkticons, Kup says something, (I think it's after he rips the tail off one of them), his mouth doesn't match what he says.