Hocus-Pocus and Frisby - S3-E30
Revealing mistake: Make-up for the space aliens was apparently changed after the closing scene in the store was shot and before any footage of the aliens' "true appearance" was actually taken. This resulted in Frisby, who is now telling the truth and finding no one to believe him, saying that the aliens had a single eye in their foreheads, when in fact, the aliens each had two eyes, in the traditional location. (00:24:00)
Stopover in a Quiet Town - S5-E30
Visible crew/equipment: When the camera pans to Rod Serling for his opening narration, you can very briefly see several crewmembers and some backstage equipment.
[A bomb in Wadsworth's room is seconds from going off, causing the Chancellor to panic].
Chancellor: Please, please let me out. In the name of God, let me out. Let me out! Let me out!
Wadsworth: Yes, Chancellor. In the name of God, I will let you out.
Trivia: The centerpiece of Lou's sidewalk toy display is a wind-up Robbie the Robot from the film Forbidden Planet. (00:01:05)
Mr. Dingle, the Strong - S2-E19
Question: What was the reason for giving Mr. Dingle super strength?
Answer: It's explained in the episode. The aliens are experimenting to see how humans react to various scenarios. This just happens to involve them using super strength.
Thanks. It's been a long time since I saw the episode so I forgot.