Trivia. This episode was writer David Gerrold's first professional sale ever.
Early title was : "A Fuzzy Thing Happened to Me . . ."
Tribbles were originally called 'shaggies,' 'goonies,' and 'pufflies.'
Gene Roddenberry called noted science-fiction author Robert Heinlein after first reading the script. GR wanted to avoid a lawsuit because he thought that the "Martian Flat Cats" in RH's 1952 novel The Rolling Stones" were very similar to DG's Tribbles. RH was very gracious and he told GR to go ahead with the episode.
William Shatner reported that the entire cast enjoyed making this episode because it allowed them to play comedy for a change of pace instead of serious drama.
James Doohan insisted upon performing his own stunts in the bar brawl. Stuntman Jay Jones doubled JD in only a few brief fight sequences.
One of the few times Scotty & Chekov have a conversation together.
William Campbell (Captain Koloth) was allowed to take home a bunch of the Tribbles props and give them to the kids in his neighborhood.
Wah Chang designed the Tribbles.
William Campbell would reprise his Koloth character on Star Trek: Deep Space Nine in "Blood Oath."
Charlie Brill would reprise his character Arne Dearvin on ST: DSN in "Trials and Tribble-ations."
It required 8 takes to get the scene where the Tribbles fall out of the storage unit onto Captain Kirk's head. The exasperated look on William Shatner's face was for real.
James Doohan brought his young twin sons Chris & Montgomery to the studio during the filming of this episode. He told them to sit quietly inside the shuttlecraft set and be good boys while filming went on. Chris told how he and his brother got bored and restless and snuck out of the shuttle and explored the studio. They discovered a cabinet and wondered what was inside of it. When they opened the door hundreds of the Tribble props fell on them. The frightened boys fled back to the shuttlecraft and remained there. Later on, their father came and told them he was proud that they were such good boys and did what they were told.
37 years later, Chris told his father what he and his brother had done that day. He said his father was furious, just as if it happened that day.
The K-7 Space Station was later recycled for "The Ultimate Computer."
The K-7 bar set was reused and from the episode "Court Martial." So was the bartender's outfit.
Tribbles can be seen in the bar that Dr. McCoy goes into in Star Trek: III The Search for Spock.
Chekov reports on the Organian Peace Treaty in the briefing room scene at the start of this episode. This refers to the first season episode "Errand of Mercy."
TTWT was nominated for a Hugo Award in 1968 for "Best Dramatic Presentation." It lost out to Harlan Ellison's "The City on the Edge of Forever" episode of Star Trek. David Gerrold and Harlan Ellison would later become good friends.
Director Joseph Pevney said that this was his favorite episode of all those he directed on Star Trek.
Producer Robert H. Justman didn't care for this episode as he thought the characters parodied themselves and the over-the-top humor lacked realism.
Writer Samuel A. Peeples ("Where No Man Has Gone Before," "Beyond the Farthest Star") also disliked this episode. Third season producer Fred Freiberger (Space: 1999) was also not fond of this episode.
Gene Roddenberry did not care for this episode at first, although years later he listed as one of his top 10 Trek epsiodes.
Whit Bissell who played Commander Lurry of K-7 co-starred on Irwin Allen's The Time Tunnel (1966~1967) as General Kirk.
Stanley Adams (Cyrano Jones) later co-wrote the Trek episode "The Mark of Gideon" because he was concerned with real life overpopulation situation. He was not pleased how his script was heavily rewritten for the aired episode.
Stanley Adams provided his voice for Cyrano Jones on Star Trek: The Animated Series episode "More Tribbles, More Troubles" that was written by David Gerrold.

9/10 missed no.9

10 of 10

10 of 10. That's more like it.

8/10 I haven't watched TOS in a while. The DS9 Tribble episode was great, if for no other reason than seeing Terry Farrell in the TOS uniform.

6/10 Thst's bad considering I had a girlfriend back in the mid '70's that had an actual tribble.

9/10. Classic Trek episode with plenty of humor and scripted by David Gerrold. Stanley Adams does a splendid job as Cyrano Jones.
One of the only episodes where the actors playing Klingons do not wear swarthy makeup for some reason.

You got 10 out of 10

8/10 but I did watch it not too long ago.

7/10. Eh. Not surprising. I'm not a Star Trek fan. I only watched this one because William Schallert was in it (though I had a "wait, WHAT?!" moment when I saw ending credits. Charlie Brill as Arne Darvin.)

I got 8 out of 10, and had not watched this in over 40 years! lol scary!

9/10.

6/10. Not one of my favorites.

1/10

Missed the first three questions and then ran the table. 7/10

9/10, a classic episode, really funny. The animated series also did an episode with Tribbles.

9/10. 417/440. Disappointed that I missed #5.

10/10. You'd have to rate this episode as Trek's comedy episode. Even the Klingons, aside from the barroom brawl, were in no mood for a space battle. I loved it when Kirk had the whole crew from the bar lined up wanting to know who started the fight. Even Scotty was confined to quarters.

8/10 Soft tribble,warm tribble little ball of...whatever the hell they are.

Whenever I see that photo on top, I think it should be captioned "Shatner considers his next toupee"...LOL!