According to an interview Wes Bentley gave to the New York Times in 2010, this movie was made during the middle of his decade-long, extremely serious addiction to cocaine and heroin. Bentley admitted in that interview that he only accepted the few movie roles he had during that time so that he would have money to buy 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".