Bashir gets reckd by Voyager's Robert Picardo also (as Dr. Lewis Zimmerman and the Emergency Medical hologram) in "Dr. Bashir, I Presume". The "archaic" EMH is confronted by the even more presumptuous Holo-Bashir, triggering a four-way catfight between the holograms and their templates.
While "Nog" was away at Starfleet Academy, Aaron Eisenberg played a Ferengi waiter in "Bar Association".
Jeffrey Combs, playing clones of the same character, gets to play a good and evil (ie. normal) version of Weyoun arguing over a commlink; he also played the Ferengi character Brunt. Combs always wanted to appear as both Weyoun and Brunt in a single scene, but never got the chance. He did, at least, get to play both characters in the same episode, Season Seven's "The Dogs of War".
Siddig was considered for the lead role because the producers mistakenly took his old age makeup for his real appearance. This is referenced in "Distant Voices" in which Bashir rapidly ages from a silver fox to a doddering geezer.
O'Brien finds himself 'typecast' as the hitman Falcon in Bashir's spy holoprogram, mirroring Colm Meaney's pre-Star Trektypecasting as the same ex-IRA bad guy he plays in every film (see Under Siege).
Like his character, Andrew Robinson is claustrophobic. He had trouble wearing the prosthetic early on. Garak also spoke of posing as a gardener while conducting surveillance on Romulus. His stint at the Cardassian Embassy coincided with a number of mysterious deaths that year, including a Romulan proconsul who was found poisoned. This is an in-joke by Andrew Robinson, who is passionate about gardening in real life but hasn't murdered anyone. (That we know of.)
When Kira is complaining about how she feels being pregnant with the O'Brian's baby she says "This is YOUR fault!" to Dr. Bashir. Nana Visitor was really pregnant with Alexander Siddig's child. Also, in the Bennyverse ("Far Beyond the Stars"), the pulp authors played by Visitor and Siddig are a couple, just like in real life.
Sisko has an extensive collection of African art (like Avery) which he gradually moves to his new space station digs. In "Past Tense" and "Badda-Bing, Badda-Bang" he's revealed to be something of a Civil Rights historian (again, like Avery), making him a perfect guide into the underbelly of Federation culture. Also, Avery may have been touched by The Prophets in real life... he's a little off-beat at times.
William Shatner: Avery Brooks, what a great guy. But he's a little out there. He's doing Jazz things in his head.
Aluminum Christmas Trees: "Far Beyond the Stars" seems to be a full episode about EC Comics's Judgment Day (printed around the same time this story is set), which killed the magazine when the publishers and editorial disagreed over having the hero be black. Note also the reference to D.C Fontana, a woman who wrote pseudo-anonymously for The Original Series way back in the sixties.
Ira Steven Behr asked James Darren and Iggy Pop to play a role because he was a fan of their work. Both ended up getting a divisive reaction from the fans. Behr is also a movie buff, and nearly all of his scripts include a nod to some distant western or war movie.
B-Team Sequel: The first Trek series to be created without direct input from Gene Roddenberry, and it shows, especially in the later seasons, which are much Darker and Edgier than Roddenberry's optimistic vision of humanity's future.
The Cast Showoff: Inverted in "Take Me Out to the Holosuite". Max Grodénchik was actually a successful semi-professional baseball player who seriously considered going pro before becoming an actor instead. The reason Rom plays left-handed in that episode despite not being The Southpaw in the rest of the show is that Max simply couldn't play badly enough to convincingly portray the worst player on the team any other way.
Dawson Casting: Even though Nog was supposed to be in his mid-teens at the start of the show, Aron Eisenberg was 24 years old when it premiered, and ten years older than Cirroc Lofton, who played Jake.
Development Gag: The name of the episode "The Siege of AR-558" comes from 558 being the development number of the episode. It fits the overall idea of the battleground being such a random nondescript place that it doesn't even have a real name.
Doing It for the Art: Frank Langella's uncredited appearance in the first three episodes of Season 2. He didn't want to make it seem like he was appearing on DS9 for money or exposure.
Dueling Shows: With Babylon 5 during its '94-'95 run. B5's auteur J. Michael Straczynski claimed for years that Paramount stole his story treatment, but he has since backed down after internal company memos came to light that showed the idea circulating around before he pitched his show. The two would remain rivals throughout their respective runs, with B5 wrapping up a year earlier in 1998. The two shows' similarities begin at being set on a space station at a trade crossroads and don't stop there:
Both had a female commander who began the show as a staid, by the book officer. Over time, Dax and Ivanova became more rough and comedic.
The dirty-tricks squad Bureau 13/the dirty-tricks squad Section 31.
Dukat and Lord Refa Weyoun concoct a story that Ghemor made a deathbed decision to embrace the Dominion, which is exactly what happened to Emperor Turhan.
A (barely) oblique reference is made to this on B5. In one episode, a gift shop is set up on the station. One of the characters loudly derides this idea, saying "This isn't some deep-space franchise! This station is about something!" It should be noted that the writer of this episode, Peter David, has written several Star Trek novels. (When he wrote that line into the B5 script, it was with the expectation that JMS and friends would change it, if only to a more subtle jab, before shooting; upon learning that the line was filmed and broadcast verbatim, David remarked to JMS that "...you people are dangerous over there, aren't you?")
The Deep Space Nine writers weren't above including their own subtle jabs at B5. One episode featured Bashir having to chaperone a cadre of Ambassadors visiting the station and putting up with all the crap that comes with it. According to JMS, the writers of DS9 actually liked B5. The producers, not so much.
There are massive parallels between the Sheridan/Shadows and the Sisko/Pah-Wraith arc. Sisko is marked for death by the Prophets for defying them and takes a high-dive into the Fire Caves, 'killing' him while transferring his essence to a spiritual realm: the situation is a mirror of Sheridan's trip to Z'ha'dum and his later vanishing into the Rim.
DS9 had trouble finding its feet initially, leaning on unresolved arcs from TNG and more or less sticking to its episodic format (not unlike VOY & ENT). As Babylon Five began to make waves with its much-hyped, five-year war saga, the Dominion War was shortly introduced.
The intrusion of Section 31 into Federation politics is incredibly similar to B5's PsiCorp.note The latter was headed by Walter Koenig (Chekov), coincidentally. J.J. Abrams revived Section 31 for the film reboot, making it Deep Space Nine's longest-lasting influence on Trek as a whole.
There was also an amusing incident involving actor Robert Foxworth, who had appeared on B5 as Earthforce General William Hague, part of the conspiracy to overthrow President Clark. He was then mistakenly double-booked by his agent as the very similar Admiral James Leyton on DS9's "Homefront"/"Paradise Lost " two-parter, resulting in Hague being killed offscreen in "Severed Dreams". (Bruce Mc Gill said in an outtake for that episode that Hague couldn't be present because he was "doing Deep Space Nine.")
Enforced Method Acting: To have an episode where a character questions their entire sense of self is a big ask of any actress, but to claustrophobe Nana Visitor (who was used to a teeny prosthetic on the nose), it was like entering an iron maiden. In "Second Skin", she claws at her Cardassian face as though it is a mask that she wants to rip off – and she actually did, pulling apart her latex and fleeing the set in terror. They somehow managed to get the episode in the can, but it was her hardest episode to film.
Andrew Robinson explicitly played Garak as bisexual in his first scene with Dr. Bashir. Writer Robert Hewitt-Wolfe corroborated this, adding that Bashir was supposed to be oblivious to his advances. This plot thread was swiftly bundled out of sight by Paramount, though it doesn't entirely go away (at least as far as Garak's mannerisms go.)
Fake Brit: Actually averted with Julian Bashir, played by Alexander Siddig, an English Arab born in Sudan. This makes one of only three times in the franchise a non-American main cast member was played by an actor of the same nationality (the others being Colm Meaney as Miles O'Brien, and Dominic Keating as Malcolm Reed).
Fake Russian: Major Kira is reimagined as Colonel Anastasia Komananov ("Gay-Chee-Pee"), in Bashir's totally-not-James Bond holoprogram. Even Nana Visitor, an American, gleefully admitted that it's a terrible accent. This is commented on by Vic in "His Way". When pressed, he admitted that his sexy Kira duplicate, "Lola Chrystal", is just a modded version of the Colonel Komananov hologram and that it took him forever to get rid of her horrid accent.
After taking an extended break to raise her son, Terry Farrell finally started making the rounds at conventions. When she appeared at FedCon XIX in Bonn, Germany (the largest fan gathering in the world) in 2010, the standing ovation lasted for over three minutes.
One noticeable thing about the Ferengi episodes is how beloved they are in the UK and how much Americans seem to loathe them. This may have something to do with British humor. As a whole, Europeans react much better to Ferengi episodes than Americans, as the humor, while not necessarily bad, is peculiar and not in the show's usual vein. Only the universally loathed "Profit and Lace" is disliked.
Hilarious in Hindsight: Joseph Sisko wanted his son and grandson to come home and take up the restaurant business, and he put them to work in his restaurant whenever they returned home. Cirroq Lofton, who played Jake, got into the restaurant business after DS9 ended.
Baseball players in "Take Me Out to the Holosuite". Aside from Avery Brooks (Sisko) and Cirroc Lofton (Jake), the actors playing the Ferengi were the best baseball players in the cast. In fact Max Grodenchik (Rom) played college ball. The Ferengi being who they are, however, forced them to play left-handed and employ other tricks to look horrible on film.
Armin Shimerman has been on the board of directors of the Screen Actors Guild and worked against various entertainment corporations to secure actor's rights. Quark is a staunch anti-union and anti-worker's rights Ferengi. Then again, since Bioshock came out, he's given interviews stating his appreciation of Ayn Rand's books, so he may not be so easy to pigeonhole.
Lost in Character: A trivia example. Visitor was afraid Kira would rub off her, making her "frightening and aggressive", as it was becoming considerably easier for her to snap at people. She made good efforts to avoid that.
McLeaned: Jadzia Dax was killed off after contract re-negotiations with Terry Farrell fell through (the early makeup calls were getting to be too much; several cast members had reached their wit's end by that point). Terry left the show in Season 6 to join the cast of Becker. She later regretted this decision, calling Jadzia a "superhero."
Quark's mother, Ishka was played by Andrea Martin in her first appearance, and Cecily Adams in all subsequent appearances. According to Armin Shimerman, Martin disliked acting in heavy makeup, and declined to reprise the part.
Tora Ziyal was played by Cyia Batten for her first two appearances, but the producers decided that she was too young for the part and replaced her with Tracy Middendorf for Ziyal's third appearance. Due to Middendorf proving allergic to the prosthetics and having poor chemistry with Garak's actor, Andrew Robinson, however, she was replaced by Melanie Smith for all of Ziyal's subsequent appearances.
Though apparently Klingons physically mature faster than most races... Alexander would have been about 8 years old when he began military service. Being 1/4 human didn't seem to matter any considering future Alexander seen on TNG looked fully Klingon regardless of minor human genetics.
It's mentioned in an episode of Voyager that in Klingon/human hybrids, Klingon DNA is dominant (hence why Miral Paris, who is only 1/4 Klingon, still has visible ridges on her forehead).
In "Tribunal", O'Brien faces the worst, most ill-tempered Cardassian judge on the circuit: CeCe Rhodes.
Two actors from Breaking Bad appear at the beginning and end of the series; Jonathan Banks (BB's Mike Ehrmantraut) appears as an exiled criminal in Season One's "Battle Lines", while Raymond Cruz (Tuco Salamanca) plays a PTSD-suffering soldier in Season Seven's "The Siege of AR-558".
Romance on the Set: Alexander Siddig (Bashir) and Nana Visitor (Kira) got together and had a son, with Visitor's pregnancy being written into the show. They married the next year and divorced in 2001. Which leads to a rather hilarious in-joke in the episode where Kira says "This is all your fault!" to Bashir during an argument, since (in universe) he was the one that did the fetal transplant from Keiko to Kira. Funnier still because Bajoran labor is usually quiet and easy.
Near the end of DS9, Dr. Bashir asks Odo to donate part of his natural goo to help figure out how to grow new organs. Come the early 21st Century, and humans have nearly perfected the ability to grow organs in a lab - not, admittedly, organs that can change to become the one that is required by an impending surgical procedure (which is what Bashir was aiming for).
Bashir wanted it to help find a way to grow organs on the battlefield - it's on thing to grow a new organ for a lung transplant when someone has been ill for a couple of months, but it's hard to know how many lungs, hearts, etc to have on standby on a battlefield, nor do you often have the time to grow them as the patient could die before they are fully mature.
Throw It In!: A joking reference by Rene to Admiral Ross as "Bill" in "Image in the Sand" was taken literally by the writing staff, resulting in his canonical first name. (As well as confusion for sharp-eyed viewers, as his office nameplate had previously established his first name to be Cliff!)
Troubled Production: Most of the show went by fairly smoothly, especially compared to the stuff Voyager was going through, but the six episode arc of the station being taken over by the Dominion in Season 6 really stands out as a mess of a production, with the entire crew being completely inexperienced at writing a long form story with such tight continuity. The various episode crews were constantly stepping on each other's toes as they could never predict how much time or money they would need, and entire storylines had to be swapped between episodes while still keeping everything making sense. It's quite amazing that the final result was so popular.
Vindicated by History: It goes without saying that DS9 was never in the same league of acclaim as TOS or TNG, and its relative merit vis a vis Voyager was a matter of some debate among Trekkies at the time. Nowadays, time has arguably been kinder to DS9 than its sister show, Voyager. Back in '98 and '99, Nana Visitor was giving interviews declaring that one day, fans would come around to liking the show. And voilà: fifteen years later, it's finally caught on thanks to Story Arc structure being more in fashion than episodic television, on-demand streaming making it easier to watch the show in order, and exposure thanks to Moore's later success on Battlestar Galactica.
Visitor: I remember sitting with Armin Shimerman on set and going, 'They don't really get us', and they didn't at the time. But we said, y'know, 10-20 years, they'll get it.
If you study Deep Space Nine's behind-the-scenes' trivia, you realize a good number of the regular and recurring actors became very involved with their character. Especially people like Andrew Robinson and J.G. Hertzler, who each wrote a whole novel about their characters Garak and Martok; or Nana Visitor, who met with the writers whenever she felt a scene was wrong about Kira. Another big name actor, Rene Auberjonois, consulted regularly with the writers (requesting a new uniform for Odo, etc.), though he was a little more subdued—even if he didn't particularly care for this or that plot development:
Ira Behr: Being the pro that he was, he sucked in whatever dismay he was feeling—though I still got some of those vibes. He didn't do a screaming, "I won't do it, I won't play it! No no no!"
"Rumpelstiltskin" was originally going to be a leprechaun who follows O'Brien around the station like a bad smell. A less-than-amused Colm Meaney (who had earlier endured an episode full of horrific Irish stereotypes in TNG's "Up The Long Ladder") made the writers change it.
According to Behr, Armin Shimerman was reluctant to go for broad humor since it went against his deep respect for the Ferengi. (One of Armin's old shames is his goofy and oddly racist turn as Letek in the TNG's "The Last Outpost", which cemented the Ferengi as the laughingstock of the galaxy.) Quark is often the odd man out in panto storylines such as "Ferengi Love Songs", "Profit and Lace", and "The Emperor's New Cloak". While the other Ferengi (Combs, Shawn, et al.) seem to be getting into the spirit of things, Armin's 'zany' dialog is delivered oddly straight.
Gul Dukat (Marc Alaimo) was introduced as The Heavy of DS9. Very shortly he got sick of playing the baby-eating bad guy and began to play the character as a Charmer. Problem is, he charmed the audience too.
"I could have gone one-dimensionally aggressive and mean and ugly with this character if I'd chosen to. I have the feeling that's what they kind of wanted. I thought, 'I've done that a hundred and fifty times already.'"
On his approach to playing the role, Ira Behr observed that Marc Alaimo reads every line like he's the hero of every episode he's in. "You listen to Marc talk about Dukat, and it's totally different than I see the character." The writers shrugged and let him carry on believing that, as it added some interesting flavor, but by Season 7 even Alaimo had fallen under Dukat's spell. He decided that Dukat's feelings for Kai Winn were genuine and that he would never strike a monk in a temple. Y'know, this guy who once declared the Bajoran religion a "superstition" and supervised the genocide on Bajor. Slugging a senior citizen over a book rental was beyond the pale for him.
Behr: In Marc's mind, I believe he felt his relationship with Winn was legitimate in some way, and that, in some wacky fashion, it was Dukat's bid for legitimacy. I mean Marc was actually upset when we had him hit Solbor. Until the very end, he wanted Dukat to be the hero of Deep Space Nine.
Ira Behr and Ron Moore got the itch to pursue a Kira/Dukat Foe Yay scenario (season 4's "Indiscretion", introducing Dukat's half-Bajoran love child Ziyal, is a clue to where things may have headed). Nana Visitor (Kira) flatly refused to do anything of the sort, pointing out that he was guilty of the brutal occupation and near-genocide of Kira's species. ("If you put a gun to her head, I don't think Kira would ever consider it.") Behr tried his best to jimmy the lock in various ways, such as forming a 'family unit' with Dukat, Kira and Ziyal during the Dominion occupation of Bajor. But in the end, Nana was unmovable. Finally, the storyline was handed off to Kira's mother Meru, who turns out to have been Dukat's "comfort woman" in "Wrongs Darker Than Death Or Night" (co-written by Behr).
Out of all the cast members, Michael Dorn probably had the most pull. After seven years of makeup calls, he wasn't interested in reprising his old role, but the showrunners were so desperate to have Worf cross over that they bent over backwards to make him happy. No longer would Worf be the big guy who got tossed around cargo holds!
Siddig wasn't too happy about his character being retconned into an Augment. He interpreted it as Behr/Berman et al. attempting to squeeze him into a "Data" role without consulting him, and responded by deliberately reading long equations and statistics in a drowsy, non-eloquent manner. The Augment stuff quickly faded into into the background and became all but irrelevant.
Word of Dante: Barry Jenner was mostly winging it while playing the Admiral Ross character. He decided that Ross was a conflicted family man whose son enlisted and died in Starfleet, twisting him into a Knight Templar who will stop at nothing to preserve the Federation. Internally, at least, he regrets dragging the DS9 crew (whom he admires) into his machinations.
Word of Gay: Andrew Robinson has commented in multiple interviews that he considered Garak "omnisexual," and also strongly implied it in the character book he wrote. Robert Hewitt Wolfe has stated that he wrote Garak to be attracted to Bashir, but Bashir never realized this.
Word of God: Ron Moore stated that although the background check in "Doctor Bashir, I Presume?" ended up marring Bashir's exemplary reputation, this didn't preclude him from being the new template for the Emergency Medical Hologram and — despite Dr. Zimmerman's complaints — he did actually end up being selected. Therefore fans assume that either the (unseen) EMH Mark III or Mark IV was based on Bashir.
Dax was benched (again) in "Rocks and Shoals " after sustaining injuries from the ship crash. Actually, Terry Farrell was suffering from a skin disorder which made her allergic to sunlight. This made it impossible to shoot scenes in the quarry, so she slept through the episode in a cave.
Armin Shimerman and Max Grodenchikhad previously played Ferengi in TNG's "The Last Outpost" and "Captain's Holiday". Marc Alaimo also played the very first Cardassian, Gul Macet, in TNG's "The Wounded". (Word of God said that Macet and Dukat are cousins.) He also played one of the first Romulans to appear on TNG.
J.G. Hertzler, most well-known among DS9 aficionados for playing Martok, also played Sisko's soon-to-be-dead commanding officer, the Vulcan captain of the U.S.S. Saratoga in the pilot. He also later played changeling Laas in Season 7's "Chimera". This earned him the distinction of playing two Changelings in the show: Several times in the guise of Martok (before we meet the genuine, one-eyed one), and again as Laas. This also meant that he died twice, and possibly a third time after Laas contracted Section 31's virus.