Corrected entry: In the scene where The Mask is flushing Dorian down the pool, the water is swirling the wrong direction for where they live.
Corrected entry: When Ipkiss escapes from jail, he handcuffs himself to the cop. While he is driving to the club, you can see that they are no longer handcuffed. It's a pretty big mistake considering that the cop says "get these handcuffs off of me" when you can see that they aren't on him.
Correction: It is probably because he handcuffed him to part of the car, not to himself.
Correction: It's a myth that the Coriolis force has a significant effect on the direction that water swirls down a drain. You would have to drain a small ocean to see the effect. See http://www.physics.ohio-state.edu/~dvandom/Edu/newcor.html.
J I Cohen