Corrected entry: After Jack Frost ceases to be Santa and Scott Calvin becomes Santa by putting on the suit, everything at the North Pole goes back to the way it was. Inexplicably, though, Lucy's parents, who had been frozen by Jack Frost, remain frozen.
Corrected entry: It is revealed in this movie that there is an "Escape Clause". However, if you look back on the very first Santa Clause movie it was established that being Santa Claus is a lifetime commitment or in the clause's terms "unable to do so, by either accident or design". Hence, the instruction that his coat must be worn by someone else in case something happens to him so that someone else will always carry on Santa's work. Scott already tried in the first movie to get out of the responsibility but the clause doesn't permit him to do so.
Correction: That's the whole point of the movie. Of course it doesn't seem like there's a way out, but the Escape Clause is exactly that, an override to the original clause that makes it null.
Corrected entry: How did Scott get Jack Frost to say "I wish I wasn't Santa at all," recorded on the pen, if Jack never said it or never had the pen before Jack became Santa?
Correction: When Scott is in the North Pole amusement park, Curtis is advertising pens that you can record things on, and proceeds to give Scott one of them. Later, Scott and Jack Frost meet up, and Jack says something along the lines of "I'm surprised you actually fell for it. you were stupid enough to say, 'I wish I wasn't Santa at all.'" Scott then says, "What was that?" and you can see him take the pen out of his pocket and press a button. Jack then repeats the phrase, and Scott records it. This is how Scott gets to be Santa again.
Correction: Scott and Jack are sent back to the moment they left. Neil and Laura were frozen before Jack became Santa. Stopping that wouldn't mean they wouldn't be frozen when Jack and Scott return.