These are probably the funniest mistakes I have EVER seen in a movie. There are actually two things. The first one is when the Frankensteon boy monster is getting chased by the cops these tiny little cars are chasing him and you can actually hear the wind up engine. The worst part is that it happens over and over again when ever there's a car in the scene.

The other one is when Frankenstein finally leaves the city and starts running through the woods and he gets hungry and sees this wild pig, but all it does is bob up and down like it's own a string (at least they hid the string), but for some reason Frankenstein just can't seem to catch up to the pig, even though it never moves. At around the same time, this other monster thing... its like a mole with a drill on its face or something... but it goes through this farm and there's this horse in a stall and its bobbing just like the pig. But then the monster knocks over the stall and the horse just falls over.

Funniest movie of all time, except for maybe Equinox.