Continuity mistake: When Lucille throws the pills to Marv, he catches it with his left hand (while holding a cigarette in his right hand). The shot changes immediately to a close up on the pills in Marv's right hand. Then in the next shot Marv takes the pills, but has to take the cigarette out of his mouth first.
Factual error: When Marv is talking with the Priest in the confessional, he cocks the hammer of his pistol as a means of interrogation. But in the next shot, the pistol is uncocked, without sufficient time for this to occur. In fact, the pistol is uncocked even when Marv shoots him. This cannot happen, since his pistol is a standard 1911 .45, which requires the hammer to be cocked in order to fire.
Revealing mistake: When Miho plugs the barrel, Jackie boy tries to fire, but when he does, the slide fires into his skull area. Notice that the barrel is larger in front. If that slide was straight, then o.k. But, the head of the barrel is larger at the far end (business end). It is not possible for the larger end to pass through the rest of the gun (focus on the bottom part) without every part of the gun disintegrating.
Continuity mistake: After Jackie has sat down on the swastika-formed throwing weapon, he is shown crawling on the ground. The swastika is then shown sticking out of his buttock in a horizontal position to his thigh. When he is leaning against the trash can, the swastika is shown again, but this time it sticks out pointing downwards (in relation to his thigh), at a 90 degree angle from it's original position. The points on the blade would have kept it from twisting in the wound, and Jackie did no movements that would cause it to twist.
Continuity mistake: When Yellow Bastard is giving his "Recognize my voice?" speech, whilst pinning Hartigan's face to the floor with his foot, you can tell from his eye line in the first shot that he is a fair distance from Hartigan, nowhere near close enough to have his foot pressed into his face. Yet in the next shot, the foot is in frame, pressing Hartigan's face, as though Yellow Bastard is standing right next to him.