Continuity mistake: The AMC Matador stops as the AMC Hornet X races by on the cross-street. As the Matador halts, we see it has a proper door mirror. In a close-up of Scaramanga driving, we can just see the hole in the door where the now-missing mirror was mounted (on the VHS full-frame, we can see the remote cable hanging from the hole and the base of the mirror swinging as the mirror hangs out of view).
Continuity mistake: During the chase scene with the police, Bond swerves past a driver in a dark green 1956 Plymouth Savoy. As the police cars pass the Plymouth, the scene cuts to an inside shot of the car with the driver yelling, then the driver loses control of the car and rolls it over. The car that crashes is a green 1955 Chevrolet 210 series, not the 1956 Plymouth.
Continuity mistake: When the AMC Matador arrives in the hangar and begins attaching the jet plane equipment, we see a bracket welded to the lower rear quarter panel, just behind the door. The wing supports swing down to attach at this point on both sides of the car, yet these brackets were not on the car in any prior shot.
Continuity mistake: A significantly modified '74 AMC Hornet was used for the famous cork-screw jump sequence, taking the place of the relatively stock Hornet X used in all other shots. It is best viewed just after the jump as the car slows to turn left - the car has a much lower stance and the wheel wells are far larger.
Continuity mistake: When Bond is picked up by the Sumo wrestler in the garden Bond is upright hitting the wrestler. When they cut to the wrestler front (Bonds backside) Bond is already down over the wrestler's shoulder doing something to the wrestlers backside. They cut back to Bond front side and he is still up and reacting in pain and then bends over the wrestler's shoulder.