When Fitzhugh, Barry, and Valerie look up at Kronig over the black pieces early on, the perspective is badly off. Kronig is far lower than he should be: below the height of the king and queen black pieces, even though the camera level is nearly level with where his head should be.
Kronig and his doctor are playing a game and the pieces are all standing upright. Then Fitzhugh, Barry, and Valerie are dumped onto the board. When they land, several pieces have been knocked over and apparently have been for some time (they're not rolling as if they had just been knocked over).
50-year technology gap: Kronig's guard has a "magnetic stunner". Kronig is also a "cybernetics" expert.
Within walking distance: Kronig's estate
Supposedly alien planet: Earth Chess is a fairly well-known game, and Kronig is a grand master at it. The game is seemingly identical to the Earth version.
Fitzhugh: You programmed a chess machine. Surely you must be a chess expert? Mark: Not really. Fitzhugh: Why not? Mark: Does using an adding machine make you an expert at math?
S 2 : Ep 25
Aired 3/22/70 (50:47)
S 2 : Ep 24
Aired 3/8/70 (50:54)
S 2 : Ep 23
Aired 3/1/70 (50:53)
S 2 : Ep 22
Aired 2/22/70 (50:53)
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