The posters of Jackal Onassis seen throughout the show are actually of Roman (Martin Starr) in the Jackal Onassis makeup.
Henry tells Jackal Onassis he is going home to watch The Mentalist. This is a callback to Jimmi Simpson's recurring character on Psych. Psych frequently referenced The Mentalist.
The real name of Jackal Onassis is Arnold Shirling according to "Dennis".
Michael Kostroff (Jeff Gold) also appeared in three episodes of Veronica Mars (2004) as Mr Pope. Both shows are created by Rob Thomas.