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  • Acting for Two:
    • Melissa Benoist plays the title character as well as Red Daughter, any Martian that assumes her likeness and Overgirl.
    • David Harewood plays both J'onn and Hank Henshaw.
  • Actor Shared Background: Like Nia Nal, Nicole Maines is a transgender woman.
  • Black Sheep Hit: Despite, or indeed because of, its initial setting of Earth-38, as opposed to the continuity heavy Earth-1, the show got a lot of fans beyond those who simply watch every Arrowverse show.
  • Channel Hop: Aired on CBS in Season 1 and moved to The CW starting in Season 2.
  • Disowned Adaptation: The creator of Agent Liberty didn't like how his character was used.
  • Dyeing for Your Art: Melissa Benoist went blonde to play Kara.
  • Exiled From Continuity: As Warner Brothers doesn't like having characters appearing in films and television shows at the same time, there are periods where Superman, despite how useful he could be, is not allowed to be be shown. It's most keenly felt in Season 3.
  • I Knew It!: Who could have guessed that Earth-38 would merge with Earth-1? Well anyone who'd read Crisis on Infinite Earths or even had a passing knowledge of the ending.
  • Real Life Writes the Plot:
    • Astra was unceremoniously killed in Episode 13 owing to Laura Benanti's Broadway commitments. Repeated in Season 4 when Melissa Benoist was performing in Beautiful: The Carole King Musical stuffing Kara into full body armor with a blacked out faceplate.
    • Starting in Season 2, Lucy Lane and Maxwell Lord disappeared owing to their actors' unwillingness to move to Vancouver following the Channel Hop. The same goes for Cat Grant but the show at least explained that.
    • In Season 3, Malina Weissman was replaced by Izabela Vidovic. Why? Because Malina was aging and couldn't realistically pass as a preteen Kara anymore.
    • Kara getting pants in Season 5. Melissa Benoist found it cold to constantly wear a skirt in Vancouver.
    • The COVID-19 outbreak shut down production of the fifth season just as it was wrapping up filming.
  • Recycled Set: The Kent farm is the same one used on Smallville.
  • Troubled Production:
    • Halfway through the third season, Andrew Kreisberg was fired following an investigation into sexual harassment charges. As he'd been the driving force behind the story, and the crew not wanting to pay him royalties for using his plotline, they had had to write a new one in short time.
    • As a result of the COVID-19 outbreak, filming on Season 5 was indefinitely suspended with only three days left, leaving the finale incomplete. David Harewood even said that he doubted that they could air the unfinished product. As a result, the last episode of the season left many a question unawnswered.
  • Unintentional Period Piece: The fifth season had heavy focus on the dangers of technology and how it drives people apart. While it was already viewed as Anvilicious by some, it aired right in the middle of the COVID-19 outbreak which, as ScreenRant pointed out, has seen people rely on technology to stay connected. The whole thing has been viewed as outdated before it finished airing.
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