Deliberate mistake: When Butch is riding in the taxi and smoking, the cigarette smoke is lazily drifting out of the window of the vehicle. If they were traveling at any real speed (i.e. not on a set with a movie screen behind it) their smoke would be ripped out of the taxi by the wind. Also, when he tosses out some of his stuff you can hear it hit the wooden floor of the stage. (01:12:28)
Visible crew/equipment: When Jules is talking to Marcellus and describing what would happen if Jimmy's wife came home and found them all with a dead body, we see what would possibly happen in a scene where the camera follows the wife to where they are carrying the dead body. You can sometimes see the camera shadow on the walls when the camera follows her. (01:55:45)
Revealing mistake: When The Wolf sprays down Jules and Vincent with the hose, they are supposed to be naked. When Jules hands Jimmie his clothes, you can see Jules is wearing tan colored underwear at the very very bottom of the screen. You can only see a little bit of it, and it is a very quick shot.
Continuity mistake: When Winston Wolfe and Raquel are getting in his car to leave Monster Joe's, there is a flatbed truck and a sedan parked behind a yellow beetle across the street. In the next shot as they are speeding off, the flatbed and sedan have somehow changed into a pickup truck and a van. (02:07:30)
Continuity mistake: When Jules and Vincent are about to get hosed down, Jimmy's right arm is holding a pink towel on the right and a blue towel on the left. Jimmy hands Jules a soap bar with his left hand, but when the camera changes point of view, Jimmy's right arm is now handing off the soap and the towels seem to have vanished. In the next shot of Jimmy, the towels have reappeared on his arm but in opposite positions from where they were previously. (02:04:35)
Other mistake: When the pawn shop owner asks Zed if it is Tuesday Zed says it's Thursday, however the fight poster in Butcher post fight scene shows the date as Thursday July 16. This would make it Friday for the next morning's pawn shop action.
Deliberate mistake: Jules' famous Ezekiel quote is actually an expansion of what is in the Bible. Ezekiel 25-17 actually reads: "And I will execute great vengeance upon them with furious rebukes; and they shall know that I am the Lord, when I shall lay my vengeance upon them." (00:20:10 - 00:22:25)