Adding to the past cast and crew nods, is the line "Mister Henriksen's class?" from John Connor to Riley when they first meet. Lance Henriksen played Detective Hal Vukovich in The Terminator (1984), and was James Cameron's first pick for the T-800 Terminator in the first movie (with Arnold Schwarzenegger applying for the role of Kyle Reese!). Cameron changed the actors' roles, applying their talents to two other characters (Henriksen giving Schwarzenegger the "Terminator" role, and taking the Detective's role over) before filming.
When first viewing the nuclear power plant, Sarah is told that in the future the Resistance regains control of it from the Machines during the Battle of Avila Beach. In real life, Avila Beach, Ca is the coastal town from which access to Diablo Canyon Nuclear Power Plant is located... approx. 170 miles due north/west of Los Angeles, Ca.
Greenway talks about his lymph node removal surgeries while showing a longitudinal scar on his upper arm extending the full length of his biceps. There are no lymph nodes in the arm itself (ignoring the epitrochlear nodes). Axillary (armpit) lymph node dissection does not extend into the arm.