The Cinematographer lit Primo darker than the other characters to play him off as a darker person. He lit Claire lighter to make her come across as a warmer and more friendly person.
To play off of the bank heist premise, green was implemented into the coloring more than others to reflect the color of money. Also a cash register sound effect was used with the opening title.
The title Primo Donnie is a play off of the term Prima Donna, in reference to the character Primo who carries pretentious qualities. It also has both of the main characters names in it.
On the day of the shoot Bradley J. Birnie was very sick. He was puking all day and would go to his car after every shot. In the end his illness helped to enhance his performance, given his character feels sick for most of the short.