Actor Cameron Bigelow really did urinate in the Mason Jars. The Jars were not touched until after production wrapped. It helped bring more to the atmosphere of the room.
Hunter S. Thompson's Suicide Note is written in large letters across Henry's Wall.
Andy Petersen's all time favorite writers are Hunter S. Thompson and Cormac McCarthy. True Plagiarist was dedicated to Hunter S. Thompson and his work.
The Moth in the beginning of the film was by chance. The original script read "A cat that tries to escape Henry's Smokey room". When The Director and Star, Cameron Bigelow noticed a moth trapped in a Mason Jar, they changed the opening of the film on spot. It was pure luck to show an animal trapped such as the moth. This symbolizes Henry and how he is trapped in a room.