Tony Cox ad-libbed the "You probably shouldn't be digging in your ass" line. Director Terry Zwigoff found the line so funny that he admitted to repeatedly cracking up on set and even waking up in the middle of the night laughing.
In his autobiography "The Billy Bob Tapes", Billy Bob Thornton said that if he could go back to any time in his life and relive it, he listed this film, The Alamo (2004) and when he worked for the Arkansas Highway Department in 1979.
Billy Bob Thornton said that he's had eight year olds approach him about his role in the movie. Thornton was stunned that parents would even allow their kids to watch that movie at that age.
Throughout the film, there are several hints to Bernie Mac's character having chronic constipation; he eats oranges, mixes stool softener into his drinks, etc.
The unrated version of the film furthers the record for the most profanities in a Christmas film, including 170 uses of "fuck", 74 uses of "shit", 31 uses of "ass", 10 uses of "bitch", and 1 use of "bastard", in variable forms.
The parking lot behind the department store, which is featured in many scenes, is the same parking lot (at Del Amo Mall ) where Robert De Niro shoots Bridget Fonda in Jackie Brown (1997).
Willie drinks what is clearly meant to be Stolichnaya vodka, but at the end when the kid is laying the table and goes to the fridge, the label actually begins Snot instead of Stol.