Other mistake: When Ken was using the plunger to lift panels of the suspended ceiling, the bathroom stall next to him (and against the wall) was closed, but when he stooped to the floor to look at the broken bottle of alcohol, the stall door was open and someone's legs from below the knees could be seen. When this part of the movie resumed, Ken was opening the door to the stall. He was also walking on the area where the broken bottle was on the floor. The toilet only went as high as the person's shins. (00:33:08 - 00:35:50)
Other mistake: The time line seemed off. Ken brought his daughters to his parents' house and it appeared to be morning (not dusk). One asked why he had to work on Thanksgiving. When Ken picked up Chris to go to work, Chris' parents were just finishing their Thanksgiving dinner. At work, Marnie said, "I can't believe I missed Thanksgiving with my family..." The group of employees shared slices of turkey luncheon meat - "No one should be without Thanksgiving." The store opened at 9:00 PM - well after dinner.
