In "Cinebrainia", the silent film title cards list "co-starring Russell Calabrese" and "co-starring Greg Battes as Bigfoot", "co-starring Ken "Kino" Shita", and "directed by Ed Haney". All of these are actual Warner Bros. staff members.
In the 'Cinebrainia' segment, Hal Slug is a reference to/spoof of famed silent film producer Hal Roach.