The roof from the film in the scenes where Sean (Rob Monkiewicz) when he is sitting on it, It was actually a regular old roof just set on the ground.
The scene where Deke (Dan Merriman) is being attacked by the spider in the truck, The teeth was actually one of the crew with a pickax smashing into the roof. The crew intended on destroying the truck for the movie and since they had such a low budget, They couldn't afford a working truck. So, The scenes where it was moving, Its because they pushed it into frame.
The airplane in the movie was in another Edgewood movie "Ice Breaker".
The movie was mostly shot in Vermont in 2003.
In the begging where Chandra (Irene Joseph) is laughing is because, Sean (Rob Monkiewicz) nearly broke off part of the door and they didn't have enough time to re shoot.