Kate Hewlett, who plays Rodney's sister Jeannie, is David Hewlett's real life sister. In contrast to their characters on the show, David and Kate get along extremely well, and both relished the opportunity to act together.
The front of the house of Jeannie McKay (Rodney McKay's sister) is the same as Samantha Carter's house in Stargate SG-1 (1997).
The alternate universe version of Jeannie Miller has three children, one girl and two boys. The two boys' names are Bradley and Robbie, also the names of the executive producers, Brad Wright and Robert C. Cooper.