The game played at the beginning is Doom 3. Kerry claims he had 50,000 points and infinite blood supply, but Doom 3 has no scoring and players have only a supply of health, ammunition and armor.
Towards the end, when Justin and Kerry have their final conversation, you can see that the make-up is wiped away from Justin's neck where his turtleneck must have been rubbing.
Towards the end, when Justin and Kerry have their final conversation, the make-up is wiped away from Justin's neck where his turtleneck had been rubbing.
When the teens find James, he is supposed to be dead, but his pulse is incredibly obvious in his neck.
Despite being set in the US, while the credits are rolling, there is clearly a highway sign that has a maple leaf with a 1 in it. This is a common sight across Canada, as it's the sign indicating the Trans-Canada Highway. This certainly wouldn't be in the US.
When drawing blood from Lisa's leg, the leg is obviously a rubber prosthetic.