Other mistake: In the beginning of the song about Augustus Gloop, computer generated Oompa Loompas can be seen running through the Chocolate Room, preparing to sing their song. In the DVD release, some Oompa Loompas can be seen running to places that no real person could possibly stand on. This mistake was later corrected in the Blu-Ray release.
Other mistake: In the Nut Room, there are doors on the left and the right side for the Oompa Loompas and squirrels to enter the room. During the song, the camera faces the front of these doors, where the viewer can see that the doors are cut off 2 feet in, making it impossible for anyone to enter or leave the room through them.