When Jastrow arrived at the shooting competition he was carrying his 9mm on his left side in a cross draw position. In the next instant it's on his right side in a regular right handed carry position.
When Michael enters KITT via the sunroof after nearly being crushed by the two jeeps, Michael is inexplicably driving from the passenger side of the vehicle in the next scene.
After KITT is hit by the laser, Michael says "let's get out of here" and drives off - a circular steering wheel is then visible, rather than KITT's customized steering yoke.
When Michael has KITT check the serial number of a pistol, KITT is parked close to the white line in the parking bay. In the next scene, when Hector crashes his car into KITT's fender, he is now parked towards the middle of the parking bay.
When KITT smashes through the gates of the depository, his front grille and custom Trans-Am nose are missing. In the next scene, they're back.
Spectators would never be allowed down- range during a weapons demonstration. Indeed, said demonstration probably wouldn't be held indoors in a crowded room.
When KITT is winching in Jastrow, the cable has significant slack - it should be tight.
When Michael and Sheila duck in front of KITT to avoid the gunfire, the squibs are visible to simulate the bullets ricocheting off KITT.
During the opening cruise scene as KITT is playing "Neutron Dance" on the stereo, the tape is shown ejecting from the center console and it's a prop - on the left bottom corner of the screen, a wooden beam with a bolt attached is visible holding the prop.
After KITT jams the elevator to trap Jastrow's daughter, footage is shown of KITT speeding around a mountain bend - the footage is accelerated, as evidenced by KITT's scanner moving much faster than usual.
After Hector crashes into KITT and Michael returns to the car, as he opens the door and clears his throat, the camera crew is reflected in the door.
When Sheila is talking to Michael about the type of man she likes, the shadow of the camera harness is clearly visible on KITT's bonnet.
Sheila says that the MP5 'oozes' more firepower per dollar than any other automatic assault rifle on the market. The MP5 is a machine pistol and not an assault rifle.
When Michael drops Sheila off to pursue Jastrow, he tells her to find a payphone to call FLAG headquarters and tell Devon that he might need backup. This makes absolutely no sense, since Michael is sitting in KITT already and always uses KITT to regularly communicate with Devon - there's absolutely no need to rely on a payphone.
Michael would have been lucky to have hit the target at all let alone anywhere around the bulls-eye. Everyone's face shape is different, from the shape of the face to the distance the eyes are from the side of the head. He would have had to spend time "zeroing" the sights (moving them left or right and up and down) before he could shoot in competition.
When the two men in suits are playing the paintball game, one of them shoots his gun but no projectile is expelled.