Revealing mistake: During the shootout on the Jet, the second hijacker hides behind a wall and Harry shoots through the wall, killing him. When the bullets supposedly go through the wall, one of them puffs out black powder and marks the wall, showing it's really an explosive charge going off and not a bullet.
Continuity mistake: In the front view of the pimpmobile crossing the Golden Gate Bridge, we see that the door mirror has a shroud. This is the correct mirror for that car. Then, we see the pimp looking through the mirror at the traffic following him. That mirror has no shroud - it is the wrong mirror for that car and does not match the view we saw from the front of the car.
Revealing mistake: Near the beginning, a couple of men are shot in the back of a car. The guy in the middle, Ricca, is supposedly dead but takes several normal breaths as the shot lingers.
Continuity mistake: After the pimp is killed, Harry and his partner follow a couple of cars across the Golden Gate Bridge back toward the crime scene. The sky changes between shots of the vehicles.
Character mistake: The coroner says the pump was shot with a full mag from a magnum which is six rounds but the pimp was only shot with five.
Factual error: The woman walking past waiting fares, saying "excuse me, this is important." She gets into the right rear door of a 1963 Chevrolet, with flat door sill. In the interior of the car there is "Kick Up" in the doorsill, and a Ford door release handle, flush with the side trim. The 63 Chevy had different handles.
Other mistake: Before the shooting, we saw a reflection of the officer in the outside mirror of the limo. The glass is rectangular. The actual mirror of the '73 Cadillac Model 75 had rounded corners.
Revealing mistake: Multiple times during the final chase, tire marks on roadways are visible where multiple takes of the stunts happened.
Factual error: When the pimp murders the hooker in the taxi, he is said to have forced drain cleaner down her throat. However, he uses an aerosol can. You can even hear the metal ball shaking inside of it several times. In the 1970s, drain cleaner did come in metal cans, but what he is using is a spray can of some kind, which drain cleaner did not come in. It is always in liquid form to pour down a drain, spray would not release enough.
Chosen answer: The error didn't necessarily start with the makers of the credits. It could have crept into the process at any point. Whoever typed up the names to give them to the technicians who made the credits could have misspelled the name.