When Colonel Carter is unpacking in her new quarters, you can see a picture of General O'Neill.
Jason Momoa covered up the tattoo on his left forearm in previous episodes, but the writers decided to include him getting the tattoo to explain its presence.
The dialog between Samantha Carter and Teal'c, before she leaves the SGC to take command of Atlantis, is an emotional exchange that mirrors the real-life ending of the show Stargate SG-1 (1997) and Carter continuing on "Stargate Atlantis", breaking up SG-1.
Beginning with this episode, before they were able to fully integrate Rachel Luttrell's pregnancy into the series, the crew filmed her from varying angles to hide her mid-section (from the sternum up, from behind, or in shadow), as well as had her wearing loose-fitting tops, holding objects in front of her mid-section, or in the case of action scenes, used a body or stunt double.
Amanda Tapping (Samantha Carter) and Christopher Heyerdahl (Male Wraith (uncredited)) would go on to co-star in the series Sanctuary.