Other: The family runs upstairs with the dog and the squirrel and then runs downstair. You can see a cut in the movie, because the rug moves.

Revealing: When Clarke and Eddie push the couch to see what happened, the burned cat is only visible in closeups. There's also a blue object next to the couch that look like an iron that is creating the smoke effect.

Revealing: In the scene where Clarke cuts the ropes on the Christmas tree in the living room, if you watch in slow motion you can see large wooden poles connected to the branches of the tree as they burst through the windows.

Continuity: In the opening scene where Clark and the two guys in the pickup are racing, Clark pulls under a 18-wheeler. In the close up shots, you can see the truck's tyres from under the truck, but in the far away shots, you can see the safety bars that were put under the truck for the stunt driver so he wouldn't ride up under the truck.

Revealing: When Clark falls from the top of his house, he grabs the gutter. It bends and a icicle is thrown from it to his neighbor's house. You can see the thread which guides it.

Visible crew/equipment: When Eddie and Clarke are putting the burned couch in the garbage, you can see the shadow of the camera following them.

Continuity: The retractable attic staircase is a type held closed only by light spring pressure, not a latch, but it doesn't budge when Clark jumps on it. When he initially opened it, and later when his wife does the same, it opens normally with a light tug from below on the cord.

Continuity: In the scene when Clark is going into the attic to hide presents, the ladder that smacks him in the face is a sliding ladder, but later when he is shut in the attic and uses the ladder to attract attention it is a folding ladder.

Continuity: When Clark's neighbours return home, the man says to Clark, "Where do you think you're going to put a tree that big?" The trunk is very large, bigger then Clark's feet. Clark replies, "Bend over and I'll show you." Then Clark cuts the tree trunk - it is very thin and easy for him to cut.

Other: In the scene where Clarke and Eddy are drinking egg nog by the tree, and Snots is drinking the tree water, look at the tree's trunk. It's a birch tree not a pine.

Revealing: When Clarke and Ellen are in the bed and Clarke's hands are sticky, you can see that he actually grabs her hair to give the illusion that they are stuck.

Other: When Uncle Lewis lights the cigar that sets the Christmas tree on fire, watch closely. It shows side shots of Clark eating his dinner, and you can see the tree in the living room. The camera cuts back to Lewis lighting his cigar, and then back to Clark at the exact same angle as before. However, this time the tree is gone. Then you see the flames shoot out.

Continuity: When the family is on the front lawn to inaugurate the Christmas lights, between shots a blue Lincoln at the curb disappears and a station wagon appears across the street.

Revealing: In the scene where the neighbors fall onto the floor of their bedroom when Clark's Christmas lights finally go on, you can tell a stunt double is standing in for the female neighbor as she falls down at the foot of the bed.

Continuity: The christmas tree is visible from the dining room, but when Lewis goes beside it to smoke a cigar, you can't see him. When the tree is on fire, you don't see Lewis again and you can only see a branch of the tree.

Continuity: When Clarke is installing the Christmas lights, the rope on the ladder keeps appearing and disappearing.

Visible crew/equipment: When Ellen opens the door after Clark falls from the tree, there's a strange white thing visible for a few frames at the upper left of the door. Might be the hand of a crew member opening the door.

Continuity: After Clarke falls in the bush, the gutter repairs itself.

Continuity: When Todd, the snob neighbor, fall's down the stairs, his wife Margot is not visible in the bedroom.

Continuity: When Clarke is going crazy, he cuts the baluster. But it's still in place the scene later, when the family have problems with the squirrel.