The interior of The Club (where Dipper meets with Lil' Gideon) strongly resembles The Black Lodge from Twin Peaks.
The code message at the end of the episode reads "Carla, Why won't you call me?"
First episode of Gravity Falls not to show Blendin Blandin in the background.
First appearance of Lil Gideon.
At the end of the disclaimer in Gideon's TV commercial the narrator says " Carla, I've always loved you but never had the guts to say it". You can read in the screen too.