Trivia: In the episode "Exodus" Mon-El's mom is played by Teri Hatcher. Teri Hatcher appeared in the hit TV show Lois and Clark: The New Adventures of Superman as Lois Lane.
Trivia: The episode "Exodus" introduces Mon-El's father Lar Gand. In DC comics, Lar Gand was the birth name of Mon-El.
Trivia: Jon Cryer, who plays Lex Luthor, played Lex's nephew Lenny in Superman IV: The Quest For Peace.
Trivia: The toy figure used by the Toyman has the original Supergirl suit.
Trivia: When Jason Behr, who plays Zor-El, Kara's biological father, guest-starred on JAG in 1997, he played a naval officer with the last name Danvers.
Trivia: Cat says "you look like the attractive yet non-threatening, racially diverse cast of a CW show." This episode crosses over with The Flash, from the CW (this show was broadcast on CBS). From season 2 onwards Supergirl moved to the CW, to join the other Arrowverse shows.
The Faithful - S3-E4
Trivia: James and Winn find a meeting of Coville and his followers to be "a little cult-y." Melissa Benoist plays Rachel Koresh, the wife of cult leader David Koresh, in the miniseries Waco, a dramatization of the Waco siege - the 1993 standoff between the ATF and FBI and Koresh's Branch Davidians that lasted 51 days and resulted in 86 deaths.
Trivia: The way Deegan as Superman tries to break Barry's neck resembles Superman doing the same thing with Zod in The Man of Steel film.
Trivia: The hammer used by Lois is similar to the one used by Steel, another DC superhero.
Trivia: Although they play mother and son in this episode, Brenda Strong is only five years older than Jon Cryer.
Trivia: Erica Durance plays Melissa Benoist's mother in this episode. She played Lois Lane in the TV show Smallville, about Superman when he was young.
Crisis on Earth-X, Part 1 - S3-E8
Trivia: First crossover with the Arrowverse in which all four episodes share the same title.
Answer: Yes, s02e22. As Kara leaves her office, she said "go get them, Supergirl" to herself. After season 1, the show switched from a CBS production to a CW production and filming moved from L.A. to Vancouver. Flockhart isn't really a fan of traveling to shoot, and didn't want to be away from her family for so long.