Gus' Alias: Sh'Dynasty (the "comma to the top" is "God's comma")
Stoney Jackson, who plays Fred Dozier, was one of the stars of The Insiders, an 80's TV show that is mentioned in the following episode, Santabarbaratown. He was also on the soap opera Santa Barbara.
Psych Out: Chief Vick singing TLC's hit "No Scrubs"
Gus' Aliases: Larenz Tate, The Jackal, Burton 'Gooster' (as pronounced by reality host Wayne Brady)
Shawn's Alias: Dr. Shawn Womack
Pineapple spotting: The gift basket Amy gives Lassie has a ham adorned with pineapple slices.
Goof: Though Juliet says her father and mother have been estranged since her childhood, in "Spellingg Bee" Juliet said her parents were still together and had been married for 30 years.
Shawn's Alias: Shawn Gthorndall (with a silent G)
Gus' Alias: Suggs
Pineapple Spotting: In the basket on the counter of the Jamba Juice where Shawn and Gus take Bernie.
The baseball scene takes place at Nat Bailey Stadium, home of the Vancouver Canadians of the Northwest League. Vancouver is a minor league affiliate of the Toronto Blue Jays.
Psych-Out: Mcintyre, Hill, and Roday singing New Kids On The Block hit "The Right Stuff"
Anachronism: the 1991 sets up Tapman's arch-nemesis as Riverdance Man. However, Riverdance was not introduced until the 1994 Eurovision Song Contest.
Pineapple Spotting: There is a cartoon pineapple in the opening credits and a pineapple-shaped salt shaker on the table of the restaurant where Shawn and Juliet are eating dinner.
Lassiter signs off his note with the very specific phrase: "See you next Wednesday."
John Landis uses this phrase as a recurring gag in most of his movies, including his 1992 vampire picture, Innocent Blood.
The song "Cry Little Sister" from the vampire film Lost Boys plays when Gus & Shawn talk to the Bartender (played by Corey Feldman who was in Lost Boys).
Psych-out: What appears to be the gag reel from either a planned Psych-out or a deleted scene of Shawn and Gus attempting to have a serious discussion comparing classic 70s and 80s vampires.
The Graphics department appears to have taken a shortcut, as the information on Von Willebrand disease that is on the doc's computer screen is a copy/paste from the Wikipedia.
Pineapple Spotting: in Gus's house, as a feature on the glasses shown in the close up when his drink is being drugged
Goof: The messages on Gus' phone from Shawn are out of order; 7:38am (his most recent), then 4:33pm, then 4:35pm.
Per a Tweet by Dulé Hill, James Roday improvised his screaming speech in the morgue, and he did it in one take.
When Shawn fakes a British accent, he cites "Phineas and Ferb's grandpa" as a reference. This character is played by the episode's guest star Malcolm McDowell.