Inventions - S3-E22
Continuity mistake: When Early and Morton are talking to the cab driver, in the overhead shot there's a hat on the desk, but in the shots facing Early the hat vanishes and other things on the desk rearrange themselves.
Inventions - S3-E22
Continuity mistake: When Chet's wearing his suction cup shoes, John uses the hose to wet the area around Chet's shoes, and then places the hose down on the ground, but in the shot from inside the van John's still holding that hose.
Inventions - S3-E22
Continuity mistake: When Station 51 is on site at the major chemical leak, Roy and Johnny are wearing SCBA tanks that have distinctive markings/stickers, and their tanks change while they search, locate and rescue the worker.
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.