Continuity mistake: When Chelsea returns back to the house, she runs through the front doorway and the door behind her is still open. In the next shot, the door is closed.
Continuity mistake: At the beginning of the movie, the car the characters take to the party has European plates. Later on, the plates are American.
Continuity mistake: After Henriksen is killed, Chelsea and Jake are shown driving down the road. At first there is no license plate visible on the rear door of her SUV. A few shots later the license plate appears.
Continuity mistake: When Adam's father starts playing with the box at the end, he has a just-lit, long cigarette in one hand. The shot cuts for only a second and the cigarette has burned down almost to his knuckles.
Answer: No they are not. They are just a figment of Chelsey's imagination as Lance Henrickson's character points out he put all of everything they saw in their mind, including Pinhead.
SAZOO1975