Continuity mistake: During the conversation between Mr. Armbruster and Mr. Sloan regarding Miss White, Mr. Armbruster's arms go from being clasped behind his back to resting on Mr. Sloan's desk.
Revealing mistake: One of the actresses who is supposed to be playing a mannequin doesn't start to smile until the camera is on her.
Factual error: The baseball field is said to be in Hoboken, New Jersey, but palm trees are visible outside the ballpark at the beginning of the episode.
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.