At the end of the movie, when the Hebrew Hammer is using his Jewish guilt on Santa, Santa is holding his gun. When the shot cuts to behind Santa, he waves his hands in the air and both hands are empty. When the shot cuts back, he's holding the gun again.
When the people are at the Jewish Justice League, it cuts to a shot of a sign saying something like "Israeli Athletes Team." This is a reference to the 1972 Munich Olympic Games, where eleven Israeli Olympic athletes were killed.