Other mistake: The name of the actor who played Mike is given during the opening credits as Jordan Fry and during the end credits as Jordon Fry. (00:01:55 - 01:44:30)
Other mistake: When seen from inside the trash chute in the nut sorting room, the Oompa Loompas could not have leaned over the hole as far as they did. Other views during the same scene show they had to stay back a fair distance due to the curve in the floor. (01:15:05)
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: Squirrels are used in the factory to get nuts out of shells. Mr Wonka states that they tap the nut first to make sure it isn't a bad nut. However, this is never done until the action is pointed out.
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.
Answer: Wonka is simply uncomfortable around people. Gum chewing is simply an annoyance he never had to put up with as a recluse.
JC Fernandez