Billy Bob Thornton has said that he was genuinely intoxicated during some of filming. In the escalator fall scene, he actually passed out after drinking 3 glasses of red wine for breakfast followed by vodkas, cranberry juice, and a few Bud Lights.
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.
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.
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.