In last chase scene (40:45) lipstick on tracked vehicle collapses. In the next shot lipstick is still pointing upwards.
When Dr. Van Breegle hits Maddie and David over the head with the "American Gothic" poster it is clear that the two faces in the poster were cut before the shot so that their heads would poke through correctly.
Shot of detectives leaping out of vehicle (41:45) is sped up.