The idea of a former partner named "Reggie" has some basis from earlier in the series. In a prequel place in 1989 called Unusual Suspects (1997), Mulder gets an incoming call and answers his cell phone saying "Oh, hey Reggie." At the time Unusual suspects was made, this was assumed to be Mulder's 1989 boss, Reggie Purdue, who was seen in Young at Heart (1994).
At around 14 minutes when Reggie mentions products exploding on impact or catching fire, some of the most famous recent examples include Samsung phones (fire), Hoverboards (fire), and a decades old example being the Ford Pinto (rear impact explosion), each causing the kind of P.R. crisis that Dr. They would specialize in fixing for their respective companies.
At around 4 minutes Reggie is shown to be eating sunflower seeds, which of course are Mulder's trademark snack.
At 36:32 Scully, Mulder, and Reggie all suddenly lean to their left in a tribute to Star Trek (1966) in which the actors would all lean in the same direction to indicate that the set had tilted.
Underneath the picture of Ted Cruz on Mulder's conspiracy board is a drawing of a blobfish, which has been jokingly said to resemble the Texas Senator.
Darin Morgan: (also the writer) as Eddie Van Blundht morphing back from the form of Mulder in the flashback scene edited from Small Potatoes (1997) where Reggie comes through the door and catches "Mulder" and Scully on the couch.
Darin Morgan: [actor] Alex Diakun (Buddy) has been in almost every X-Files episode that Morgan has written. He was also the manager in Mulder & Scully Meet the Were-Monster (2016); Dr. Fingers in Jose Chung's 'From Outer Space' (1996); Tarot Dealer in Clyde Bruckman's Final Repose (1995); and the Curator in Humbug (1995). Diakun also appeared in one of the two "Millennium" episodes that Morgan wrote, Somehow, Satan Got Behind Me (1998).