Episode 3 in Season 1 is entitled "The Turk" after the eponymous chess playing computer in the episode. Several electronic chess players have been named such in reference to the original "The Turk", an eighteenth century hoax. The original was a box with a mechanical human upper torso that would move chess pieces, within the box a midget would sit and manipulate the arms with levers.
Absentee Actor: Summer Glau is the only actor to appear in every episode, especially season 2.
Actor Allusion: Shirley Manson, who portrayed the liquid metal Terminator known as Catherine Weaver, played a killer robot in a music video.
Continuity Nod: Multiple references to events in the first two movies, even a few in-jokes referring to the third movie.
Sarah's death from cancer in the timeline averted by their jump forward is a ref to Sarah dying from Leukemia between T2 and T3.
The picture of Sarah that Kyle Reese carries around as a good luck charm in the future is a re-creation (with the new actress) of a very similar pic seen in the first movie.
In the episode "Alpine Fields," Lauren's father is the same actor who played Dobson in Firefly. Seeing him and Summer in the same scene together without him pointing a gun at her and using her as a human shield is somewhat surreal.
The Persian emissary from 300, the one Leo kicks down the well, is a resistance fighter.
Throw It In: While training with firearms for the pilot episode, Summer Glau was hit in the face by an ejected bullet casing. Rather than cover up the resulting mark with makeup, the injury was left visible on Summer's face throughout filming for the pilot, as one of the "wounds" Cameron picked up in combat.