Factual error: Near the end of the film, during the big shootout scene, there are 2 girls vs. Will Farrell. If you play the movie in slow-motion, you can see that the guns the girls are shooting continue to shoot fire out of the barrel several times, even though the slide is locked back. When a handgun's slide locks back, the magazine is empty. How could they still be shooting when there are clearly no bullets left?
Factual error: The movie "Blunt Man and Chronic" was premiered at the El Rey theater. When Jay comes out he says "The party is across the street featuring Morris Day and the Time." However the location used for the club scene was actually inside the El Rey Theater.
Answer: Apparently it was a song that was improvised by Jason Lee and Jason Mewes. Stated on the commentary.