Notes
- Making a cameo appearance as an Enterprise crew-member is David Gerrold, who wrote the original "The Trouble with Tribbles" episode for the original series and helped develop Star Trek: The Next Generation; Gerrold can be seen in the corridor on the Enterprise (crouching down, with silver hair) as O'Brien and Bashir first discover the tribbles have gotten aboard ship. Gerrold wrote the character of Ensign Freeman into the original episode with the intention of playing the part himself.
- Charlie Brill, who played Arne Darvin in the original Star Trek: The Original Series, returned to play the same character in this episode of Star Trek: Deep Space Nine. According to a text commentary written by Michael Okuda on the DVD version of the episode, the producers were ambivalent on choosing whether to do a return to "The Trouble With Tribbles" or "A Piece of the Action" when they happened to chance upon Brill sitting in the same restaurant where they were discussing the planned tribute.
- Between the original episode and DS9, the appearance of Klingons had changed radically (their design had originally been altered for Star Trek: The Motion Picture). When Bashir and O'Brien ask Worf why 23rd Century Klingons look so different, he will only tell them "They are Klingons, and it is a long story”. Bashir and O'Brien ponder possible causes - genetic engineering, mutated viruses - both of which were later shown to be correct in the Star Trek: Enterprise episode "Affliction". Worf stops the discussion by saying "We do not discuss it with outsiders”. Contained in the 'Special Features' of the region 2 box set of DS9 season 5, the producers are seen to comment that the joke at the Klingons' expense was as much for plausibility's sake as for the purpose of humor, claiming "any explanation we could come up with would have been ridiculous!"
Read more about this topic: Trials And Tribble-ations
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