Writers/producers:
Nicole Yorkin and Dawn Prestwich: Although this duo's work hasn't appeared yet on "The Killing", they followed Ron Moore from "Carnivale" to work on "Battlestar Galactica"'s Second Season's first very good episode "Fragged".
http://www.imdb.com/name/nm0948820/ http://www.imdb.com/name/nm0696518/ Producer Ron French worked on BSG
http://www.imdb.com/name/nm0294195/ Actors:
Callum Keith Rennie (Leoben from BSG) as Sarah Linden's fiancee
http://www.imdb.com/name/nm0719678/ Michelle Forbes (Admiral Cain on BSG) as Mitch Larson
http://www.imdb.com/name/nm0000405/ Richard Harmon ("Caprica"'s Tad) as Jasper (I'm so glad this fantastic Canadian actor got this opportunity.)
http://www.imdb.com/name/nm2113653/ Kacey Rohl ("Caprica"'s suicide bomber in the Eric Stoltz-directed episode "Unvanquished") as Sterling
http://www.imdb.com/name/nm3821782/ Genevieve Buechner ("Caprica"'s Tamara Adams and also "The 4400"'s Lily's daughter) as high school girl who's up to no good.
http://www.imdb.com/name/nm1068777/ Colin Lawrence (Raptor pilot Lt. Hamish 'Skulls' McCall in several BSG episodes) plays Benjamin Abani in two episodes.
http://www.imdb.com/name/nm0492687/ I can't find the entry anymore, but someone said:
Tahmoh Penikett (BSG's Helo) said he'd be in the penultimate episode of the season.
http://www.imdb.com/name/nm0671886/ Patrick Gilmore (BSG's Rafferty in episodes "Deadlock" and "Someone to Watch Over Me", according to imdb, though I can't remember him)
http://www.imdb.com/name/nm1112955/ Barclay Hope (BSG miniseries' Colonial One pilot) as Jasper's billionaire dad
http://www.imdb.com/name/nm0393953/ It's obvious this show is filmed in Vancouver
*Billy Campbell ("The 4400"'s Jordan Collier) as mayoral candidate Richmond; okay he wasn't on BSG, but he begged President of Sci Fi Bonnie Hammer to get him an arc on the show and said he'd do it for free.
http://www.imdb.com/name/nm0001004/ These are just a few associations I noticed watching this very interesting show. Anyone found any others?