Revealing mistake: The white ball on the back of Ken's Santa Claus hat reaches to about the bottom of the white band, but occasionally is lower and sometimes even touches his shoulder. The slight variation in the amount of his forehead that extends below the hat does not appear to be able to account for the ball's reach relative to Ken's neck/shoulder. Also, the location of the seam on the left side of the white band moves higher or lower. Ken is never seen adjusting his hat. (00:16:17 - 00:16:39)
Continuity mistake: The location and pattern of blood splatter on Chris' face, as well as its presence or absence, varied numerous times. Initially, Chris had blood on both sides of his mouth and on his chin, but when he was getting up, only some blood on the right side of his mouth and much less on his chin was visible. Later, there was blood on the left side of his mouth, but it was a different pattern; then it changed back. After he wiped off his face, he later had more blood on his chin and right cheek, etc. (00:39:55 - 00:51:00)
Continuity mistake: Chris had strands of his bangs hanging down on his forehead but not a second later when the camera panned to a wider view to include all the group of employees. (00:30:44)
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.
Revealing mistake: When Archie swung the fire extinguisher in front of the woman, it did not look like the fire extinguisher was close enough to strike the woman's body, let alone knock her out. Also, when Archie came out and closed the door, he would have been walking where the woman's body was on the floor. (00:34:05)
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)
