Continuity mistake: When Lance is describing the different types of heroin to Vincent, he points to the first two baggies with his right hand, then begins to point to the third baggie with his left index finger. When the shot changes back to the baggies, we can see him pointing with his right hand again. (00:27:15)
Continuity mistake: When Pumpkin and Honey Bunny are talking in the coffee diner at the start of the film, the sugar pot and milk pot on the diner table both constantly move between different shots throughout the conversation. The leaflet at the edge of the diner table also moves about between consecutive shots. (00:00:45 - 00:02:50)
Continuity mistake: While Mia and Vincent are eating at Jack Rabbit Slims, Mia's cigarette keeps changing hands. She holds a cigarette in her right hand, reaches into her pants for her cigarette packet, and takes one from the pack so now she is holding two. She then asks Vincent to roll her one of his, and when the camera cuts back to her she is only holding the cigarette packet. (00:35:35)
Factual error: In The Bonnie Situation when the white kid busts out of the bathroom and empties his "canon", there is absolutely no recoil on the weapon. The gun is either a .357 magnum or .44 cal and would have a huge kick after firing. In this scene, he fires all the shots with barely any recoil at all.
Continuity mistake: Vincent crashes his car into Lance's house. The front appears to be wrecked (after the crash we do see a large steam cloud coming from the car's front end which would indicate a ruptured radiator, thus rendering the car not drivable), yet after the ordeal, Vincent drives Mia home, and the car is fine.
Continuity mistake: When Vincent and Jules are at Brett's apartment at the beginning of the movie, Jules takes the hamburger from Brett's table after he asks to taste it. The hamburger in the first shot simply contains cheese and ketchup, but when Jules bites it there is only a leaf of lettuce. Moreover, the hamburger appears first intact, but in the next shot it appears already bitten.