When Felix's mom gets his report card, she asks how he passed Mr. Harris' class, and he says that he wouldn't fail chemistry, but when Ben is looking in the yearbook, it says that Mr. Harris teaches US History.
When Ben is playing horseshoes in the attic, and he picks up the last one, he inspects it, and it flops like rubber.
Felix is told the security code is 1036 but Danny enters 4036 into the security panel.
When Ben and Felix are sneaking into the house, and Felix first enters, when Ben trips onto the drum set, Cameron Dallas is clearly seen trying not to laugh, to the point were he grins.