Revealing mistake: When Tim Allen startles Santa Clause and he falls off of the roof, Santa's foot kicks up a blanket that was used to look like some snow on the roof. (00:14:10)
Revealing mistake: When Tim Allen is looking at the reindeer, one reindeer's ear moves. At this point you can see the metal robot in the base of the ear.
Revealing mistake: When Santa slips on Scott Calvin's snow-covered roof, you can see the "snow" wrinkle as he slides.
Revealing mistake: When the elves are tying up the police officer at the station, they do so in a really quick manner. The film here is obviously sped up. You can tell this by the fact that the children playing the elves are breathing really fast.
Revealing mistake: When the original Santa falls off the roof, the path he slides is already visible before he falls, especially in the point of view shot.
Answer: The elf on top probably ignored him as he was in no position to answer him. The elves seem to have a stratified society [i.e. some make toys, Judy provides food/beverage, some do security etc.] so it was most likely his job just to punch in the code so the sleigh would descend. With Bernard being the head elf, and probably the most knowledgeable on all things Santa related, he would be in the best position to talk to Scott and answer all of his questions.
Invader_Gir