Continuity mistake: When Gran first dangles down from the ventilation shaft, the slaver's key ring is too wide to fit through the opening. But when Jim loses his balance and Gran is jerked back into the cell, the key ring is suddenly much smaller than before.
Continuity mistake: At the beginning, Shaft is crossing the street and a taxi jumps around between cuts. In the overhead shot, he passes the taxi and walks in front of a taxi, but in the level shot, he is in front of a brown car and giving it the finger.
Continuity mistake: One of Mr. Browne's apples falls on the gravy when he is juggling, splashing his face and shirt. Later his shirt is spotless.
Continuity mistake: When the scientists are using the blocks on Zira, Zira is told to point to the blue blocks. As she points, the blue block is at the front of the pile from the scientist's perspective. In the next shot, the blue block is suddenly in the middle of pile. (00:13:30)
Continuity mistake: When we first see Jones's van, it already has the flaps for the gun ports in the side, even though the van isn't converted to an armoured vehicle until later in the film.
Continuity mistake: Donna Mills' tape gag is tight when being menaced by Jessica Walter, but when Clint finds her on the bed the gag is much looser and she can mumble.
Continuity mistake: When the farmer threatens Henry VIII with a fork after he catches him in the barn with his daughter, you can see that Henry is holding on the fork and it is well away from his body, but in the next shot the fork is pointing near Henry's face.
Continuity mistake: The pint of beer seems almost full during the visit to the pub, with Tim's wife. It's suddenly half empty when he drinks it, then almost full again.
Continuity mistake: During the wedding sequence when Walter Matthau is trying to force his daughter Mimsy out of the bathroom his vest is closed with his tie inside. The next second the vest is open. Then it switches back to being closed again.
Continuity mistake: When Frankie is eating the cake on the bus, the amount of icing around his mouth changes between shots.
Continuity mistake: When waitress Genevieve (Eleen Brennan) is coming out of the kitchen, two plates on one arm, they are nearly empty. The door hits her from behind, and the plates are now filled with cheeseburgers and fries. (00:06:20)
Continuity mistake: Before Nancy is at the door, Fielding makes a mess on his kitchen floor with the frozen food. Immediately after Nancy enter his apartment, the view from his living room shows no mess on the floor.
Continuity mistake: After Duke gets frustrated that Mr. Longene still hasn't given him the combination to the safe he asks for Socks, and when it cuts to Everson and his team rappelling to another building, as Everson climbs over the railing his shoes have changed to climbing boots and his badge has vanished.
Continuity mistake: When Willard goes to confront his boss, Al Martin, about killing Socrates earlier that day, we get a good view all around Al Martin's office. There are a few rats on the desk, coffee table and a chair; but there are absolutely no rats climbing the curtains. Al Martin realises Willard is insane and they struggle briefly, whereupon a single rat leaps on Martin's arm and bites him as he screams. In that moment, seven rats suddenly appear climbing high up on the curtains behind Al Martin. The camera makes a one-second cut to Willard for his famous line, "Tear him up!" The camera immediately cuts back to Al Martin, and now all the rats have disappeared from the curtains in the background.
Continuity mistake: At the end of John Pithiou's dinner speech there is a close-up on the black butler. In that close-up, the collar of his vest flutters, shaken by the fan activated by the other slaves in the background. In the previous shot he was in the same hunched over position, but the fan had no such effect - you can tell by the position of the slaves in the background that he is standing in a different spot even if he was not supposed to move. (00:20:35)
Continuity mistake: A shoulder wound Raquel Welch has becomes a graze to the upper arm in the next scene.