Audio problem: When Scott is making a distraction, he says, "Well, this show stinks." But his mouth is saying, "Well, this show sucks." Done in order to keep the G rating, I presume.
Audio problem: When Frost and Scott are on top of the roof, it shows the younger Scott (as seen in the first movie). Everything from movement and actors and sounds are the same, except for the way Santa yells as he falls off the roof.
Chosen answer: Then it would have been the older Scott that became Santa, and also would have created a paradox since the younger Scott would never have become Santa.
Bowling255 ★