The Rip Van Winkle Caper - S2-E24
Factual error: When they looked at Mr. Herbie's case, they only saw the skeleton. Problem is the clothing was missing, where there should have been some remnants. And the vehicle started with no trouble. After a hundred years, the battery should have been dead, and the engine inoperable.
The Rip Van Winkle Caper - S2-E24
Revealing mistake: The suspension machines are nothing more than large terrariums, there doesn't seem to be any electronics or piping or machinery of any kind attached to them.
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.