Night(mare) of Grammar at the Museum

I am always amazed at how well lines are delivered by actors and actresses, whether it is for a television show or a movie. I am amazed that there aren't a lot of 'ums and ahs' on these sets. There is only one poor use of grammar in this movie, and that is when Teddy Roosevelt says to Larry the night guard "I'm made of wax, Larry. What are you made of?" It could have been "What of you?' and sounded very historically correct.