Shawn introduces Gus as "Lavender Gooms." This is actually the name of Dule Hill's great-aunt. Dulé Hill has mentioned that this is one of his favorite of Gus's aliases.
Kelly the craft service person character on the episode is named after the series' actual craft service person, Kelly Fry.
When Lassiter looks at the stars' red chairs, including the one for Shawn, there is another chair with the name "Esteban Franks." Esteban is Spanish for Steven. Steve Franks was the one that created "Psych."
James Roday (nee James David Rodriguez) is of Mexican descent and speaks Spanish.
Shawn speaks to an AD named Roger and calls for Ivan when he gets food on his wardrobe. These are the names of Psych's 2nd AD Roger Russell and Costume Set Supervisor Ivan Lehner.