Julius Benedict: You have no respect for logic. I have no respect for those with no respect for logic.
There is a scene where Arnie and Danny DeVito are in the washroom of a nightclub. In one shot there is a beer bottle on top of a paper towel dispenser, and in the next shot it's on the other paper towel dispenser.
At the house where Julius meets one of his fathers, you can see Ivan Reitman's children. Jason Reitman is the boy playing basketball, and Catherine Reitman is the girl that notices her grandpa in Julius' photo.