Langara is the home world of former SG-1 member Jonas Quinn. Glynis Davies, who plays Maryann Wallace (Eli's mother), also played a Langaran character from a rival nation to Quinn's in Stargate SG-1 (1997).
The power generator station is 'The Powerhouse at Stave Falls' located about 30 miles east of Vancouver. This 100 year old hydroelectric station is a popular tourist sight and filming location.
When Dr. Rodney McKay enters the room in the opening scene, the theme to Stargate: Atlantis (2004) can be heard in the background.
McKay is paranoid that Brody may have ingested citrus while they switched bodies via the communication stones. In Stargate: Atlantis (2004), McKay is known to be somewhat of a hypochondriac who believes he has a deadly allergy to citrus fruits, a claim his colleagues don't take seriously.