Blanche, the mall elf at the gas station, has tattoos down her right arm. It's actually a cloth sleeve that bunches up where her arm bends.
The movie takes place in December around Christmastime, yet the sign on the diner door says that it will be closed for maintenance on June 30th. Obviously, the movie was filmed in June.
At 1:19:50, all of the elves sing "Save Our Santa", but they're supposed to be frozen in magical ice thanks to the freeze ray the bad guy used on them earlier. Minutes later, these same elves that were already unfrozen and singing are now being unfrozen.