Just after Chase receives the phone call from the Sherriff about the wrecked oil truck, in the next scene the shadow of the boom mic can be seen in the lower left corned of the frame, next to the police car, right before Chase pulls up in his dragster.
The locomotive pulling the train that crashes off of the bridge knocked down by the title creature changes from a switch engine to a streamlined unit, then back to the switch engine but pulling in reverse and then back to a head-on view of the streamliner just before the crash.
Chase is seen taking white wall tires off of a wrecked car and putting them on his own. In the next scene he has black wall tires on his car. The white wall tires change back and forth several times from scene to scene after that.
Just before the train crash, there's a shot of Shug Fisher, playing Old Man Harris, in his
car, reacting to the sight of the Giant Gila Monster. Reflected in the windshield is director Ray Kellogg giving Fisher the cue to turn his head.