The film supposedly takes place a few weeks before Halloween, yet the calendar in the mom and pop store is set to May.
(at around 17 mins) While at the Clown Show, the spotlight shines just on Casey's face even before they shine it on him.
After Casey exits, Cheezo gets back to the ring, but when Geoffrey goes after him, Cheezo is still in the audience.
When Casey and Geoffrey are in the bedroom together they lock the door after hearing Randy trying to scare them from downstairs. However after they hear the glass breaking they walk up to the door and turn the key anti-clockwise yet the door is now unlocked.
The window that Casey and Geoffrey push Dippo through is smaller on the inside of the house than the one he is seen falling out of on the outside.
(at around 1h 2 mins) When Casey pulls the lamp out of the wall the power socket sparks, but the power is out in the house.
(at around 19 mins) When Geoffrey comes out of the Clown Show tent to look for Casey, you can see the shadow of the camera.