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10. There were two special prosthetic makeups for Glenn Howerton. One of them was for fresh kill (which took 3 hours in the make-up chair), when he was shot in the face by Scott Speedman, and the other was for 1-hour-later prosthetics.
9. According to Bryan Bertino and Liv Tyler, the finale had much more interaction and dialog between the victims and the strangers in the original script. It was cut to keep the intruders mysterious and eerie.
8. Liv Tyler suffered from tonsillitis during shooting.
7. The script was originally titled “The Faces.”
6. According to director Bryan Bertino the film is partially based on an incident he experienced as a child. One evening, a stranger came to his door, asked for someone who wasn’t there, and left. Later, Bertino found out that other homes in his neighborhood had been broken into that night.
5. The exterior shots of the house were filmed at an actual farm house. The film makers were surprised to discover the property had a barn, garage, a forest and a long enough road.
4. Shot in chronological order.
3. The film was shot entirely with hand-held cameras or steady cams. Every shot has some camera movement.
2. During filming, in order to get an actual reaction from Liv Tyler, Bryan Bertino would tell her where to expect a loud bang from, but would then have the loud noise come from a completely different direction.
1. Before filming any scene after The Strangers begin terrorizing the couple, Liv Tyler would have to run laps, do jumping jacks, and other physical activities to get her out of breath. This was so she would have the panicky feeling the real life characters would have been experiencing
