When Paul returns to his camp and the townspeople follow, as they are pulling out to give chase, the '55 Chevy Nomad has only it's driver side headlight lit. When they are chasing him on the road, and after Paul pull off and hides, both of the Nomad's headlights are illuminated.
When Grant falls into the mine, dirt bounces away to reveal the stunt pad underneath.
The entire wall moves as Perry breaks down a door.
In the first two appearances of Gerald Sommers in the office, when he turns his back to the camera, there is a round hole or large round black spot in the back of the leg of his left pant leg.
When Perry attempts to break down Mr. Grant's hotel room door, he shoulders the door hard twice and the door doesn't give way either time. The shot changes to inside the room with Perry (now) successfully breaking in the door.
One print has the closing credits, including the cast credits, for the previous episode, The Case of the Shifty Shoebox (1963).
When Perry, Paul and Della are down in the gold mine, no light source is present; however, all three individuals have brightly lighted faces when they were deep in the mine.
Perry and other characters refer to the "mileage on the speedometer" and the mileage being rolled back. They should have said odometer, not speedometer. It's the odometer that registers miles traveled on a vehicle.