Continuity mistake: In the scene where Vince Vaughn is complaining to Harvey Keitel in Harvey's office about the hitman he hates his gold necklace is either tucked into his shirt and red tracksuit or hanging out. This alternates throughout shots but during the same conversation.
Continuity mistake: In the scene when Chilli Palmer comes home to find a dead assassin waiting for him, he calls a friend to help him move the body. When the friend gets there, they lift the body up to get his wallet, as they sit him back down, you can see his eyes moving. In the next shot, his eyes are looking a different way. Dead people do not move their eyes all around.
Continuity mistake: In the scene when Lynda Moon meets Uma Thurman for the first time she puts her bag on her shoulder after she gets out of her car, it is visible that she puts one of the straps over her shoulder while the other appears to be twisted but in the next shot both straps are over her shoulder in the normal fashion.
Audio problem: In the scene where Christina Milian is auditioning for John Travolta and Uma Thurman, it is painfully obvious that the audio for her song was pre-recorded. Her voice sounds distant, as if it were miles away.
Audio problem: Almost every time guns are aimed or moved quickly, you hear clicks or metal sounds that people associate with firearms. However, guns only make these noises when the shooter manipulates the gun itself. Guns don't make "racking" noises just by aiming them.