Adam Sandler donated copies of this movie to U.S. military bases supporting Operation Enduring/Iraqi Freedom in the Persian Gulf as soon as it was released. The donated version contains a five-minute introduction by Adam Sandler, who personally thanks the troops for what they are doing.
Buddy picks up a golf club and a baseball bat before choosing the baseball bat to smash the window of the Lexus. In 1994, Jack Nicholson was cited for smashing a man's window with a golf club in a bout of rage.
At the same time this movie was shooting the hospital scene on the ramps at Columbia University, Comedy Central was filming Porn 'n Chicken (2002) right outside. In fact, the graduation set for Porn 'n Chicken is in the distance outside the glass wall. Kurt Fuller (Frank Head) appeared in both films.
Mayor Guiliani's line: "You can do it!" was referencing Rob Schnieder's line in Adam Sandler's other movies, such as The Waterboy (1998) and Little Nicky (2000). Rob had been cast in most of Sandler's movies, but he wasn't in this movie.
Adam Sandler's character Dave wears a Central Pride T-Shirt representing Central Highschool in Manchester, New Hampshire. All of his movies contain an item or reference to either school, city or state.
In the scene where Dave (Adam Sandler) smashes his boss' lamp with a golf club, he says "See, I golf also, you should bring me sometime." This is a reference to Happy Gilmore (1996), in which Sandler plays a golfer with anger problems. He then says "so when I get out of jail sometime in the next two to five years." Sandler starred in The Longest Yard (2005), where he was sentenced to three years in a state penitentiary.
The trivia items below may give away important plot points.
New York City Mayor Rudy Giuliani appeared as himself (a baseball fan) and yells to Dave Buznik (Adam Sandler), "You can do it!" This line famously features in many of Adam Sandler's films, where it is usually shouted by frequent Sandler collaborator Rob Schneider.
In the scene where Adam Sandler is kissing Marisa Tomei in Yankee Stadium, if you look behind them to the right, an extra is wearing a Boston Red Sox cap. The Red Sox are arguably one of the Yankee's biggest rivals.