Robby takes out his electric guitar to impress Wendy and begins to shred and the guitar is heard loud and clear. Weird, considering how Robby's guitar is not plugged in.
During a cutaway gag that happens twice, Soos is shown playing a trumpet in the background while a jazz solo is playing, but the instrument used in the background music is actually a saxophone.
Dipper explains that the first step in his plan to dance with Wendy would be to "Getting to know each other with playful banter". When is list is shown in a close-up (at 4:20 and at 21:57), step number 1 however reads "Smile".