Continuity mistake: When the cop pulls over the mob's limo, he parks his motorcycle perpendicular to the vehicle, but in the next shot it is parked facing in the same direction as the limo.
Visible crew/equipment: After Callahan removes the bomb from his mailbox, he looks up at a man on the nearby stairs. As a car drives by on the street, the lights from it cast the shadow of the boom operator onto the wall.
Visible crew/equipment: After the pimp is stopped by the policeman on the motorcycle and shot, the camera pulls back showing the pimp's arm lolling through the car window and the reflection of the camera crew moving about on the back, driver's side wing.
Continuity mistake: In the car with Callahan, after picking up the bomb, Briggs puts his glasses on twice.
Continuity mistake: When Callahan is in the car with Lieutenant Briggs after they pick up the bomb they drive by the 76 service station three times in about 30 seconds.
Revealing mistake: A metal ramp is visible on the front bumper of the 1972 Ford Galaxie sedan when it rams the motorcycle head on.
Audio problem: When Callahan gets out of his car to stake out the robbery, he shuts the car door, and the sound of the door closing is heard after the door is shut.
Visible crew/equipment: When the corrupt copper pulls over the pimp, there is one shot where the camera is zoomed into his glasses. You can see the camera and 2 crewmembers reflected in them.
Continuity mistake: When Harry is being chased down the steep winding street he hits a car with the driver's side of his car. In one subsequent shot, the damage is shown to the passenger side instead.
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: When the pimp is being followed on the Golden Gate Bridge by one of the motorcycle cops, the shot starts near the center span but in the next couple of shots, they are at the beginning of the bridge.
Visible crew/equipment: When Harry is running up the steps to enter the aircraft carrier, you can see a camera and crewman in a white hat below, just above the wood wall.
Continuity mistake: During the supermarket scene, one of the thugs points his shotgun at Early Smith and tells him to "Freeze". At this point you can see the till is open, but after a quick cut to Harry, we return to the cash desk and the till is now closed.
Continuity mistake: When one of the hijackers says "Now close that door!" to Harry in the aeroplane, he is pointing his gun directly at Harry, but in the next shot he is pointing his gun downwards.
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.
Visible crew/equipment: In the scene just after the pimp is shot by the cop in his Cadillac, the right side of the car is shown as the cop walks back to his motorcycle. The filming crew is visible moving around in the reflection of the car paint of the right side quarter panel, in spite of the paint being dulled to reduce the reflections.
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.