Visible crew/equipment: When R. William Neill is watching the news on the TV, in the TV station, you can see a camera reflected in the right hand side of the TV screen.

Continuity: When Karen enters Dr. Waggners office, the phone on the desk is right by the edge, closer to the door. After Karen finda Terry's corpse, the phone is now on the other edge of the desk.

Continuity: When Karen enters Dr. Waggner's office, she leaves the door halfway open. After finding Terry's corpse, the door is now almost shut.

Continuity: When Terry jumps out of the window, she rolls into a log, and moves the hatchet from an angle so it falls down. In the next shot it's sticking up at an angle again.

Continuity: When Terry is on the beach, she stops the dictaphone, and begins to write. Between shots the dictaphone changes position on the tape player.

Continuity: When the two station reporters are showing Eddie's drawings to George Waggner, the drawings change position on the desk between shots.

Visible crew/equipment: When Karen enters the pornography store, to meet Eddie, as the camera lowers to follow her, you can see it reflected in the glass of the front desk.

Continuity: When Karen finds Terry's corpse, there is nothing visible on her, and half her body is shown. In the next shot a white blanket is suddenly on her body, all the way up to her neck.

Continuity: When Terry begins to write notes on the beach, she has nothing in her left hand. In the next shot shes holding sheets of paper, with no indication of her picking them up.

Continuity: After Karen has a nightmare on the couch, Bill comes in and comforts her. Karen's grip on Bill's shoulders changes between shots. The position of her head changes too.

Continuity: When Terry approaches the cabin, after hearing voices, as she walks towards the door it is open about a quarter of the way. In the next shot it's shut.

Continuity: When Karen is in George Waggner's office, being recommended to visit the Colony, the large potted tree/plant behind her keeps on moving, ie. it's branches keep moving, and it shifts across.

Continuity: When the female reporter is bent down at the table covered in items (then scared by the dog), the items on the table shift positions between shots.

Continuity: When Eddie is transforming into a wolf in front of Karen his left hand turns grey and grows hair down to the knuckles. Then in the shot of his arm muscles expanding, his left hand has a normal skin color and hair only down to his wrist. Apparently, while editing no one checked to see how his hand was already established.

Continuity: When the werewolf attacks Terry, it pushes things at her; note the pedestal which flies into her - the white sheet falls off of it. In the very next shot the sheet is back on the pedestal again.

Continuity: When the female reporter is scared by the dog, she whacks the dog with her book, which then flies out of the window. In the very next shot the book is suddenly back on the table.

Visible crew/equipment: When the two station reporters are investigating Eddie's room, as the female bends down to the table, she is scared by a dog. In one shot you can see a black wire on the dog.

Continuity: In the control booth, the amount of black handkerchief that sticks out of Fred Francis' front jacket pocket, keeps on differing between several shots.

Continuity: When Fred Francis is at the control booth, his stance changes between every shot, from standing up straight, to bending over, with his leg up, then down, etc.

Factual error: The rifle which Dennis Dugan's character is using has to be reloaded before every shot. Still, when he shoots Slim Pickens, he somehow manages to hit him with two bullets within a second.