Continuity mistake: At the end of the movie when David Soul has gone flying into the bay from the aircraft carrier, Eastwood gets up painfully from the deck and pulls his jacket down off his shoulders, and we see that it's bunched beneath his right elbow and upper arm. However, the next shot looking up at him looking down at the water shows the jacket is perfectly straight.
Continuity mistake: When Callahan jumps onto the hood of Palancio's car after the police raid, he is facing the rear of the car, grabbing the hood near the windshield. A few seconds later, he is seen sprawled across the hood, facing the front of the car, and then seconds later he is back in his original position.
Continuity mistake: As Clint Eastwood hunts down the last store robber, he moves swiftly from behind the end of a row of shelves, quickly aims and shoots number three hood dead. This is filmed from behind and his stance is legs spread akimbo. But in the next shot, looking back at him with gun raised, his right leg is braced forward and left backward.
Continuity mistake: Motorcycles used by traffic officers throughout the movie are Moto Guzzi V7 850. In the scene on the docks, two officers arrive on Moto Guzzis, but the moment they ride up the narrow ramp, they suddenly ride Triumph Bonnevilles. The two Triumphs are slightly different. Trained eyes can tell that the traffic cop and Callahan use them interchangeably, switching back and forth a few times. (01:45:45 - 01:52:55)
Continuity mistake: The cop walks up the hill to the pool party scene with 2 pipes and the bomb satchel in his hands. When he gets there the pipes magically turn into a machine gun.
Continuity mistake: When Early Smith is confronted by a thug with a shotgun in the store, the number on the till is "3.21", but a few shots later changes to "1.79".
Continuity mistake: When the thug with a shotgun tells Early Smith to get down on his knees during the supermarket scene, you can see a female assistant standing next to Early, but when Harry shoots the thug dead, the assistant has disappeared.
Continuity mistake: When Early Smith runs out of the supermarket and shoots one of the three thugs, he lowers his gun after killing the thug. In the next scene, he is holding the gun back in a raised position.
Continuity mistake: When Harry, dressed as an overseas pilot, enters the aeroplane during the hijack scene, one of the hijackers draws his gun right in front of Harry when he says "Good afternoon". In the next scene, the gun is further away from Harry than it was in the previous shot.
Continuity mistake: When Lt. Briggs is being interviewed after the swimming pool massacre, we see a close up of Briggs and there is a man with a moustache next to him. But when we cut to the next shot where Briggs is on television at Carol McCoy's house, the man with a moustache has suddenly disappeared.
Continuity mistake: After one of the cars escapes from Palancio's hideout, we get a view from the driver's seat and Harry fires a bullet into the windscreen and the car is heading directly for an office. In the next scene, the car is much further away from the office than it was in the previous shot.