Other mistake: When Buddy's brother is reading Santa's list he reads the newscaster's wish he looks and mutters something about letters meaning they were in alphabetical order. However when he is saying random names he does not turn the page and the names are not in alphabetical order. (01:23:00)
Suggested correction: After he says each name, it cuts to that person and their reaction. Most of which was done without going back to Michael. Therefore, we can't say he didn't turn the pages.
Other mistake: How was Buddy able to buy the negligee for his father? He has no money.
Other mistake: When Buddy confronts the department store Santa (Artie Lange), watch the kid sitting on his lap. He's mouthing the words of both Buddy and Santa as they're saying them.
Other mistake: When Buddy's brother gets a skateboard from Santa Claus in Central Park the skateboard trucks are mounted incorrectly. Both are mounted the same direction. The kingpin always faces the inside of the board, but here one is mounted facing outside.