According to an interview he gave to the New York Times in 2010, this movie was made during the middle of Wes Bentley's decade-long, extremely serious addiction to cocaine and heroin. He said in that interview that he only accepted any movie roles during that time so that he would have money to buy enough drugs.
There were 14 white dresses. Each one was in various stages of dirtiness and decay.
The film was shot in two months, exclusive at night, at a real working Toronto parking garage.
Three different dogs were used to portray the Rottweiler.
In Spanish, phonetically, the title "P2" sound exactly "pe dos". That means: farts. Spain distributors opted for the more generic "Parking 2".