The Nike representatives are real Nike ad representatives, not actresses.
When Mel Gibson waxes his legs in his bathroom, he actually did wax his legs, and it did not hurt him nearly as much as it hurt him in the movie. He kept taunting all the women on-set, saying, "Come on, this doesn't hurt at all!"
First movie to mention the online auction website eBay (founded in 1995). In the respective scene, Bette Midler thought of her "lamp on eBay," repeated instantly by Mel Gibson.
The film was originally titled "Head Games" and was pitched to Touchstone Pictures in 1996 as a star vehicle for Tim Allen.
Nancy Meyers was hired to re-write the script (uncredited) before she was asked to direct it. She said "I got to say a lot about what I was going through in my life. There are speeches and nuances that were pretty much what was going on with me. I spent six months on it, and I didn't keep a lot of what was there."