When Teddy and his classmates are sneaking in the Principal's office, Teddy says to Theresa she needs to stall the principal, but she thought she needed to flirt with him. She then starts talking about hearing a guy saying "I'm gonna crack that up like a walnut.", but her mouth actually says "...crack that butt like a walnut.", which was used in the trailer.
Carrie farts on Teddy in the hexagon. Teddy remarks about the smell. Carrie replies it is a gas: methane. Methane is a component of farts, but is in fact odorless. The gas that makes farts smell is hydrogen sulfide. She teaches chemistry, as seen on the whiteboard, so she should know this.