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.

Revealing: When Clarke is puting christmas lights on the top of his house, the ladder falls but stays at the same angle.

Other: At the beginning of the movie, when the Griswold family are in their car under the wood truck, everybody panics but not Russ, who sings or something like that.

Continuity: When Clark is outside at night rigging up the lights, it seems as though the moon is a little too large in the sky.