Did You Know?

Filmed in 18 days.

The scenes inside Jeff's house were shot mostly in chronological order.

The stunt coordinator's house served as the exterior for Jeff's house. The interiors of Jeff's house were inspired by that of producer David Higgins, who planned to shoot the film there if enough money could not be secured to build sets.

When they were filming the scene where Hayley implies that everything Jeff thinks he knows about her is a lie, producers asked if they could include a line where she states that she was actually 18 years old rather than 14. Ellen Page was adamantly against the suggestion because she thought it undermined the premise of the film.

Sandra Oh's character was called Mrs. Tokuda in the script. When she arrived on the set, Oh said "I feel like a Judy Tokuda," which the director loved. However, the name had been made up on the spot and could not be cleared by the legal department, so the executive on the set asked for one take where she refers to herself Mrs. Tokuda. Oh didn't want to do the take, but finally relented on the condition that she would only have to do one take. However, she intentionally delivered the line "Tell him Mrs. Tokuda says Hi." in a ridiculous Midwestern accent, making the take unusable. The name Judy Tokuda eventually presented no clearance problems.

Despite the intense emotional and physical content of most rest of the movie, Ellen Page said that one of the hardest scenes to shoot by far was the scene at Nighthawks, where for take after take she had to eat more tiramisu than she could ever want.

The final shot of Hayley with the hoody pulled over her head was taken by the DP Jo Willems without Ellen Page knowing. She didn't know about the shot until she saw the final cut.

According to actress Ellen Page, the iconic red hooded shirt used in the movie and on the posters was, in fact, orange. The color was changed in post-production.

The parking structure scene was shot on the roof of the garage that serves the Arclight Cinemas Hollywood theater complex. When the film was shown in that theater, many patrons were technically watching the scene unfold in the same spaces where their cars were parked.

Outside of the coffee shop scene at the beginning, almost the entire film takes place within the confines of Jeff's apartment. And outside of Jeff and Hayley, there are almost no other characters. The ones that do appear either get a few minutes of screentime or none at all.

Due to the controversial nature of the film, the budget was kept under a million dollars so the studio wouldn't ask to change anything.

Brian Nelson's first draft of the screenplay was the one used in the film. It was his first official film script.

Because Ellen Page shaved her head for her previous film role, during the audition she was mistaken for a boy. The effect was so off-putting she had to put on a wig, where she then gave a phenomenal reading.

During the film's premiere at Sundance, the Dolby surround system failed. David Slade held up the premiere until they could get it fixed.