When Bo Derek's character comes out of the pool, Tommy says to Big Tom (Brian Dennehy), "Whoa, dad. She's a... ten!" Bo Derek and Brian Dennehy both appeared in 10.
In the scene where they are at the wedding reception for "Big" Tom Callahan you can see Chris Farley's brother sitting to Chris's left when Big Tom asks Tommy Boy to help him out with the song.
David Spade's character Richard Hayden says that 'Big' Tom, played by Brian Dennehy was like a father to him. Brian Dennehy would go on to play David Spade's father as Red Finch in the TV comedy Just Shoot Me!
On the DVD commentary director Peter Segal reveals that they used James Newton Howard's score to Dave and George Fenton's score to Groundhog Day as temp-track music. The Groundhog Day music was used as temp score in the "airplane scene".
According to David Spade, he and Chris Farley got into a physical altercation on the set. Spade had gone out for a drink with Rob Lowe the night before. Farley had become very jealous and angrily repeated "How's Rob Lowe?". He stepped on Spade's hand and the fight began. After the fight, Spade walked off the set and refused to continue filming.
The trivia item below may give away important plot points.
The film is actually an update of Shakespeare's 'Hamlet': Tommy is the Prince, his father dies, his mother (Bo Derek) is Gertrude, in reality married to his "step brother" (Rob Lowe) who is Claudius. David Spade's character is Horatio.