This is one of the few DC-based series allowed to use Batman, complete with onscreen appearances, whereas DC used to enforce an embargo to prevent audiences from being "confused" by the different continuities (apparently they didn't think audiences are smart enough to know what an alternate continuity is)note this had the side effect of Green Arrow being used in his place, most notably seen in Smallville; ironically, for a while, Green Arrow himself was seen as a poor man's substitute for Batman. The fact that it's separate from the Arrowverse and was initially airing on DC's private streaming service might have something to do with it. However, he was mostly The Ghost in season 1, played by stunt actors in a hallucination in the season 1 finale, whereas in season 2, he does physically appear, but only as Bruce Wayne.
Titans marks the live-action debut of long-serving and iconic Titan Donna Troy, who had many legal issues in the past preventing her from appearing outside of comic books for the longest time (hence she only had extremely brief cameos in the 2003 animated series).
Awesome, Dear Boy: Curran Walters admitted that before starring in the show, he wasn't much of an comic book fan, but after being cast as Jason Todd, he started to study the character and read comic books about him until the actor became a fanboy himself. He often expressed how much he enjoys playing the vigilante and how he would love to see stories like A Death in the Family getting adapted just to see the character transitioning into Red Hood. Curran even cosplayed as Robin and Red Hood from Batman: Arkham Knight. His Instagram is also full of photos with him playing Jason Todd.
Minka Kelly and Alan Ritchson got to show off their singing abilities in the episode 'Atonement', when their characters did a karaoke of the song ""Ain't No Mountain High Enough"".
Chelsea Zhang had a short scene where she had to slow dance because the scene involved Rose trying to seduce Jason Todd, and in some of her character's fighting scenes, she does many complicated dance movements; that's because Chelsea is a dancer in Real Life, not just an actress.
Celebrity Voice Actor: The Japanese dub features two of them: Hawk is voiced by the TV and theatre actor Yu Kamio, while Dove II is voiced by TV actress Akane Matsui.
Completely Different Title: Netflix Romania has translated the show's title as "Supereroi in devenire", which in english would roughly mean "Upcoming Superheroes" or "Superheroes in the making". Which is a bit strange because "Titans" is translatable mot-à-mot as "Titanii", not to say that the original cartoon was translated as "Tinerii Titani" in the country, which literally means "Teen Titans".
Content Leak: Prior to season three, the show's hair department head uploaded examples of her work to Instagram... images that were then-unreleased promos, costume shots, and production continuity photos, none of which had been approved for posting.
Creator Backlash: When asked by a fan on Twitter about what Gar's storyline would be in Season 3, actor Ryan Potter just replied: "Storyline?".
Garfield Logan is supposedly a teenager, but is played by twenty three-year-old Ryan Potter in his introduction. This was presumably done because of the character's frequent nude scenes, which would have been harder to film with an underage actor.
Alan Ritchson and Minka Kelly also play Hank Hall and Dawn Granger during their college years while both are in their 30s.
Zig-zagged with Larry Trainor. Although he's physically played by Dominican-Canadian Dwain Murphy, American actor Matt Bomer provides his voice and appears as him in pre-accident photgraphs.
Fake Mixed Race: Thanks to the Race Lift Slade has received by being played by the Puerto Rican actor Esai Morales, Rose is now half Vietnamese and half Latino. Her actress, Chelsea Zhang is of Chinese origins despite being born in USA.
Fake Russian: Konstantin Kovar is played by English-French Mark Anthony Krupa.
Lying Creator: Brenton Thwaites raised a lot of fans' hackles when he said that Dick split from Batman because Batman became a killer, yet nothing in the show outright confirms this and when Batman finally appears, Dick is shocked that he violates his one "no-kill" rule against both criminals and cops. Even then, this is all inside Dick's head courtesy of Trigon. Though to be fair, given all the changes the show has gone through behind the scenes, Thwaites' comment may be less a "lie" and more of a What Could Have Been. In the story itself, Batman only becomes a killer in season 3, when he murders the Joker as revenge for killing Jason, and this is treated as an out-of-character moment to the point that Bruce nearly commits suicide because of it.
A very weird example wherein two separate actors have simultaneously been cast for the same part. Bruno Bichir was cast as Niles Caulder/The Chief for the episode that introduces his team, while Timothy Dalton is portraying him on his own show.
For many reasons, including the change of genre from animation to live-action, most foreign dubs has also changed the voice actors from previous incarnations:
The Latin American Spanish one is a very brutal one, as the dub were switched out from Venezuela (animated series) to Mexico (live-action).
The Japanese one is also pretty notorious on this, as it also replaced all the long-time voice actors from the Teen Titans (2003)'s era, considering they also dubbed them in both Teen Titans Go!, Young Justice (2010) and most Japanese dubs of the DCAU. The only exception is Yūki Kaji as Robin, as he already voiced him before in Batman Ninja, although as the Damian Wayne iteration of Robin instead of Dick Grayson.
A very interesting cross-continuity one happens in the Latin American Spanish dub: Bruce Wayne is voiced by Sergio Gutierrez Coto, who already voiced him in the dubs of The Dark Knight Trilogy films, through only in the first season, since Gerardo Reyero voices him in the second one.
As mentioned above, the Brazilian dub reprises the voices of the main team, except for Raven.
Gar and Kory got the same voices from Teen Titans (2003): Charles Emmanuel and Luisa Palomanes, respctively. It works well because they use their natural voices here, while, in the cartoon, they raised the pitch.
Dick was voiced by Sergio Cantú, the voice actor of his Nightwing version in the second season of Young Justice (2010).
Ricardo Schnetzer had not only voiced Slade in the Teen Titans cartoon, but he had also voiced previous live-action versions of Slade as well, in Arrow and in The Stinger of the movie Justice League (2017).
Speaking of which, Jorge Lucas, who had voiced Batman in the DC Extended Universe, voices Bruce Wayne here.
Spoiled by the Cast List: A variation. Many of the characters appearing in the show (such as Arsenal, Donna Troy, Elasti-Girl, the Jason Todd Robin, Solstice and even Batman) have been spoiled by casting breakdowns that, while they've tried to be vague on who they are, were pretty obvious to anyone familiar with the comics.