Best action movie mistakes of 1970

Other mistake: When the Japanese planes take off for Pearl Harbor, some of the 3 man torpedo planes only have a pilot.

Deliberate mistake: There are absolutely no lights ever to be found in the underground world and the ceiling is literally the surface's ground, but there is still a perfect level of lighting in the underground world regardless.

Factual error: The Prussians are shown as wearing black with the Death's Head logo. In fact they wore dark blue. The uniforms shown were worn by Brunswickers who fought with Wellington.

Factual error: During the scene where Clint Eastwood is trying to convince Don Rickles to join in the heist, there is a box of Almond Joy candy bars behind Don's head. They weren't introduced until 1946.

Plot hole: At the end of the movie, the sheriff is going home and gives his deputy and the mayor a ride home. They pass over a bridge with a sign that says 'Leaving Colusa County'. Surely they don't live outside the county?