Continuity mistake: During the time Sean and Kunle are talking to Bianca after class, Sean is wearing two gold necklaces but only the longer one is showing a few times. (00:04:30 - 00:05:41)
Deliberate mistake: While roasting marshmallows, Henry's marshmallow caught on fire with the flame shooting about 6", then a foot+ high. A marshmallow subjected to such intense heat/flame for many seconds would not be stuck to the stick and stay stuck with repeated forceful flicking or "whipping" of the stick like Henry did. When the marshmallow finally flew off the stick and landed on a camper's head (higher than would be expected), it would be small/hard/charred, not large and still soft/white in the middle. (00:35:03)
Continuity mistake: During the "Good Afternoon" number, Ferrell and Reynolds are standing in front of horses. They're fairly close to the two. The scene changes and the horses are further away.
Revealing mistake: A white truck could be seen in Tamra's rear window, following her car at varying distances. After Tamra hit Randall on his bike, the white truck was still there but gone when the camera returned to a front view of Tamra. Use of a green screen - the truck could not have gone past the accident or "disappeared." (00:03:35 - 00:04:10)
Continuity mistake: Jackie holds her pen as she takes notes. Next, her pen is set on the legal pad and her hands are on her lap (below the table and pen). The camera returns to Jackie, and she continues to hold the pen as she takes notes the whole time. (This allows for other questionable variations that could occur off-screen, if enough time.) (00:38:57 - 00:39:29)
Plot hole: On Christmas morning, Karen went to the grocery store (open on Christmas!) where she donated $5,000 via credit card to the "Homeless Mother Shelter." Hours later, the $5,000 already showed up on Chris' laptop as deposited into the shelter's account. It takes days, not hours, for credit card transactions to be processed - especially if the transaction occurs on a holiday. (01:14:10 - 01:23:20)
Continuity mistake: The front wheel on Brian's "flying cuckoo clock" (adult tricycle with attachments) is parallel to the rear tires while he is behind the bike trying to start the makeshift "motor." Brian is always shown in back of the bike, but the front tire is angled to the left after the third camera shift and is at a greater angle after he gets the motor running. (The force from Brian spinning the motor may have caused minor shaking of the bike, but wasn't enough to turn the front wheel). (00:04:30)
Continuity mistake: Marge had her left hand on a Win Fall ticket that (supposedly) was coming out of the printer on the side of the machine. Marge moved her hand away without removing the ticket. When the camera shifted, the ticket was not there. (00:54:10)