Fake Russian: Vlada Vana, from Czechoslovakia, playing Ivan, the former Soviet astronaut.
Genius Bonus: The guard's discussion in the beginning involves someone he knew who grew plants while chanting "om mani padme hum", which is a Sanskrit mantra also known as "the jewel of the lotus flower".
Throw It In: Word of God says Barry Corbin ad-libbed the line "I'd piss on a spark plug if I thought it'd do any good!"
What Could Have Been: The original writer of the story said that he wanted Falken to be played by John Lennon, and Lennon was reportedly interested in the role. Alas, of course, one Mark David Chapman ensured that this would never come to pass.