Trivia: A somewhat comical behind-the-scenes fact: During filming, in order to get the actors to jump and act scared at the right moments, director Adam Wingard would occasionally secretly carry around an air-horn and "honk" it when the actors weren't expecting it. (And then obviously dub over a scarier sound effect in post).
Trivia: Spoilers: At one point during the climax, you can briefly see a creature with long arms and legs barging through a doorway for a split-second. Many viewers assumed that this was the titular "Blair Witch." However, the screenwriter has stated that any creatures/specters visible in the film are meant to be grotesque manifestations of the witch's past victims (with the long-limbed creature presumably being Heather given she's in the place where Heather died), and that as stated earlier in the film by one of the characters, nobody can actually "see" the witch herself.
