The bullet hits in Sledge's practice target are visible in the close-up before he shoots (there are 4 indentations that become holes one at a time).
After Hammer rescues Doreau, she says, "Thank goodness you followed me here," and Hammer replies, "Don't thank goodness, thank gun." But you can see that they are actually saying, "Thank God," instead of "Thank goodness" which was dubbed in post-production.
In the opening scene, a newspaper named "San Francisco Dispatch" is shown establishing San Francisco as the location. But Los Angeles street signs are visible in all of the outdoor scenes.