The movie was initially going to be in black & white to pay homage to the classic 1940s Universal Monster movies. This was changed when the director was convinced by the producer and cinematographer that shooting in color would be more visually interesting and could pay homage better to Tim Burton's films.
The What's-Its-Face's canonical real name is Charlie Miranda. His name was decided on set when everyone was asking what its real name was. Miranda was the director's mother's maiden name, and Charlie came from YouTuber Moist Cr1t1kal after the director's girlfriend suggested it.
The set used to film The What's-Its-Face was reused from a thesis set from the year before for a project titled Blinds Wide Open (dir. Ben Sutherland). Nicholas Horne, the director, believed it would be ideal to use what they already had and wrote the script around the apartment set layout.
When the What's-Its-Face goes off to the kitchen, the tune he whistles is "Monstrous Lovers" which was one of the Voltaire songs considered for the credits.
Aurelio Voltaire was gracious enough to allow the filmmakers to use any of his music for the film. They ended up using a song from his "Heart-Shaped Wound" album "Human Nature" for the credits. Other songs that were considered were: "Safe In Your Love" "Stuck with You" "Butterfly" "Monstrous Lovers" "Anniversary" and Voltaire's David Bowie covers "As the World Falls Down" & "Magic Dance Underground". "Human Nature" was selected because it felt appropriate for the film's ending and was a song written about Spock from Star Trek, and luckily the director was a Trekie!