Continuity mistake: When the decrepit Mr. Holt gets his new young body (briefly necessitating a different actor in the role), his German accent mysteriously disappears. He gets it back when he returns to his old body. (00:21:00)

The Twilight Zone (1959)
1 continuity mistake in The Trade-Ins
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.
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?
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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.