David Blue was not just a casual "Stargate" fan. He had watched every episode of Stargate SG-1 (1997) and Stargate: Atlantis (2004) before pre-production on this show even began. He says that being part of 'Universe' "brings pride in being a part of it but also immense responsibility in every scene'. Brad Wright joked to a audience at the 2009 San Diego Comic Con "With David we got not only an actor, but a technical adviser for our own show!"
That man's a lot of work.
Hunter Riley cannot have the rank of Sergeant. The Air Force eliminated the rank of Sergeant in 1994. By the number of stripes on his collar insignia, his correct rank should be Senior Airman.