Years later, Thomas Dekker revealed how happy he was with the way the series ended. Yes, it would have been nice to come back for a third season, but he still felt that this was a highly satisfying conclusion.
The patch on Kyle Reese's coat is a Little League Umpire patch. This is significant because in the episode "What He Beheld (2008)", Derek takes John to watch 2 boys play baseball. It is revealed that the 2 boys are Kyle and Derek Reese as kids. This scene at the end is also a nod to The Terminator (1984), where Kyle Reese steals an olive-colored trench coat from the department store after arriving in 1985. The jacket itself seems to hold some significance for Kyle Reese.
After the series ended, Lena Headey was cast as antagonist Cersei Lannister in Game of Thrones (2011). Her co-star Emilia Clarke would go on to play Sarah Connor in Terminator Genisys (2015).
The ending was meant to lead directly into Terminator Salvation (2009), which was released shortly after the show's conclusion.