Revealing mistake: After Gage gets bitten by the rattler, when the driver of Tractor 2 begins ascending the cliff, there is a nice close-up as he passes and this young stuntie is most certainly not the older driver seen in this scene. Not to mention the watchless driver suddenly acquires a black watch and a plastic face shield attached to the helmet.
Revealing mistake: At the start of the episode, in the closeup shot of Chet, Roy, and Johnny as they're talking about their trip, we can see the Land Rover hood's base plate where the vehicle's spare tire is supposed to be mounted, but the tire isn't there because of the mounted camera facing the actors in the vehicle. In other shots the spare tire is properly mounted on the Land Rover's hood.
Revealing mistake: After the snakebite, when the guys carry Johnny and place him at the back of Engine 51, the chrome spotlights are shiny and reflective, but in the closeups the spotlight near Marco has been partially sprayed with a dulling spray, to prevent the camera's reflection.
Answer: I believe you are speaking of the old man, Mr. Wilson. He's played by J. Pat O'Malley.
Bishop73
Correct, it was J. Pat O'Malley...he also played the grandfather with his grandson when their rocket exploded, and also played "Old Bill" in the episode with Ann Prentiss, where Gage saves the little girl from the burning tree house, and her mother falls in love with him.