Audio problem: When the Fantastic Four first meet Victor Von Doom, Doom says, "Now let's be clear about this, shall we? I hate you". In the next shot, his head is seen from behind, but if you look closely, you can see his jaw and face moving as if he were talking, but nothing is heard. (00:45:00)
Audio problem: After the Surfer flies by the wedding, Johnny takes off flying after him and at one point says "Man he's fast" while his face is on camera. His lips never move while saying this.
Suggested correction: Not necessarily a mistake. Little kids can have a hard time keeping track of/focusing on things. I know little kids that have a hard time looking in the direction of the camera when their picture is being taken.
Phaneron ★
There's a difference between not looking at a camera when you don't care about having your picture taken and being able to follow superheroes that pass you, especially if you're waving at them. The reason it's a revealing mistake is because everyone involved had to pretend superheroes were passing them and the kid didn't know when to turn.
Bishop73