In the house scene with Jason and Matt,the TV in the background is playing "Blood, Sweat & Brando". That film stars the "Hollow Spaces" star Benjamin L. Newmark and the "Hollow Spaces" executive producer Ercan Bas.
The bar scene extras are Director John Fink, and Executive Producer Ercan Bas.
The dialogue in the bar scene between Jason and Matt is mainly improvised by Benjamin L. Newmark and Kevin O'Herron, as are many of the "one-liners" by Newmark.
All the vehicles used in the film belong to one the producers.