When Nick (Ralph Macchio) explains the cadet equipment must be taken care of to Shawn and Gus, Shawn says, "Yes, sensei" over his radio. Later, in the field and Nick states he is twice the cop Lassiter is, Shawn says, "Well, don't just stand there and wax on about it..."
This episode is riddled with 80's and 90's pop culture references. Examples are Police Academy (uniforms and noises Gus makes) and Top Gun (Juliet teaching and Shawn/Gus' banter/dialogue during the same scene).
Spot the Pineapple: one can be seen on the hotel door, another behind Juliet when she assigns Buzz to the guys, and a final pineapple (many of them, actually) are located in the grocery store during the shoot out.