When Kowalski is putting the toys onto the table, the close up shot of the toys show them arranged one way, but in the wide shot, the toys are arranged differently.
When the sub is rocking violently and Kowalski is being thrown side to side, the microphone cord on the wall doesn't move nor do the clothes in the locker.
When the clown toy is drumming its deadly beat, during a close-up of the drum just before Kowalski comes in to destroy it, not only is the drum not being drummed but a crew member's finger tips can be turning the toy on.