The statue in front of Dougie's workplace was not originally part of the location and was brought by the production staff. It might be a statue of Donald Lynch, father of David Lynch, since according to the stand-in Tyler Malkin, Lynch talked to it saying "Hi, Dad".
Richard Horne (the man smoking in the bar) handed the bouncer a pack of cigarettes. They were Morley brand, the same brand Cigarette Smoking Man used in The X-Files (1993) along with 70+ other TV shows including Friends (1994), Seinfeld (1989), The Walking Dead (2010), Shameless (2011), ER (1994), and Criminal Minds (2005).
Frank, Dougie's coworker who discovers he likes green tea lattes, is played by Bob Stephenson, who appeared in the first season of the original series as the burger cook at the Double R Diner.
The military officer heading the investigation of Major Garland Briggs' disappearance is named Colonel Davis, an homage to actor Don S. Davis who played Briggs in the original Twin Peaks (1990). While the character is still extremely important for the series, the actor passed away in 2008.