When Tobias (David Cross) enters the Gothic Asshole (When mistaken for the Gothic Castle), The man who comes out holding the "Freedom" sign was originally seen in the Pilot (2003).
Hanging in Raulo's office at the Gothic Castle are oil portraits of magicians Le Mysticicateur Comique, Peitros & Gregorio, and The Quiet Storm.
Lucille (Jessica Walter) says that Buster (Tony Hale) has a "hole in his heart," (cardiac shunt) a fact that's mentioned several times throughout the series.
This is the first time Gob (Will Arnett) uses Europe's "The Final Countdown" during his magic shows. This later becomes his magic theme, appearing the next time in episode 1.18, Missing Kitty (2004).
This is the second time someone mispronounces Gob (Will Arnett)'s name as it's spelled. The first time was in the Pilot (2003).