Joshua had a younger brother named Isaac, who was also played by Kevin Durand.
Geneva Locke played both Max's younger self in flashbacks and her X7 clone in the present.
Development Gag: When Max meets self-made "superhero" Phil in the episode "I and I Am a Camera", he asks her if her name stands for Maximum Girl. "Maximum Girl" was a working title for the show.
Executive Meddling: Part of the reason for the sudden change in the show's thematic elements between the first and second season, supposedly an attempt to tone down the show's dystopian atmosphere in the wake of 9/11.
Friday Night Death Slot: Shipped here in its second season. The show that replaced it in that particular timeslot? Firefly. Cue fan-war.
Hey! Tony DiNozzo is Logan! And Michael Weatherly has said he was inspired by Dark Angel's Alec.
Battlestar Galactica: Sharon/Boomer (Grace Park) as a female breeding X5, Leoben (Callum Keith Rennie) as a sheriff, Chief Tyrol (Aaron Douglas) as a hotel manager, Tory (Rekha Sharma) as Dr. Beverly Shankar, Crashdown (Sam Witwer) as a transgenic named Marrow, Cally (Nicki Clyne) as an X6 named Fixit, Dualla (Kandyse McClure) as Joshua's girlfriend Annie Fisher, Narcho (Sebastian Spence) as Tinga's husband Charlie Smith, Elosha (Lorena Gale) as a teacher, Simon (Rick Worthy) as Detective Ramon Clemente, Gaeta (Alessandro Juliani) as Max's work friend Druid.
Grace Park is the only actor to have played both a transgenic and a Cylon.
Caprica: Agent Durham (Brian Markinson) as Dr. Sam Carr.
The Office: Dwight Schrute (Rainn Wilson) as Phil, the "superhero" who gave Logan his exoskeleton.
Supernatural: Mary Winchester (Samantha Smith) as Logan's ex-fiancée Daphne. Meg Masters (Nicki Aycox) as Max's sister Syl.
This is funny, as it means Jensen Ackles and Nicki Aycox, in addition to playing enemies on Supernatural, have played brother and sister on Dark Angel, although Ben and Syl didn't appear onscreen together.
If we're going down that route, then this also means that Max's love interest was engaged to the woman who becomes the mother of her sort ofpartner-in-crime. And considering it's a bit of a running gag in the fandom (especially of Alex/Max shippers) that Logan was a lot older than then 19y/o Max, having Mama!Winchester his ex-fiancée just about proved the point.
Similarly Named Works: There is a video game Dark Angel based on this series, which should not be confused as having anything to do with the video game Dark Angel: Vampire Apocalypse.
There is also an adventure supplement for Shadowrun with the title Dark Angel, and though both the game and the show are set in near-future Seattle, the adventure was released about a decade before the TV show first aired.