Visible crew/equipment: In the bathroom, when Mike's ex-girlfriend is getting undressed to take a shower a long-necked clown jumps from out of the toilet. Anyone, and I mean anyone, can clearly see the arm of a white guy sticking out of the bottom of the clown's neck controlling the puppet.
Continuity mistake: There's a scene at the beginning with an old man and a dog sitting on the porch. Not only does the dog go from looking right to left from shot to shot, but in one shot he actually gets up and almost completely leaves the frame, and in the next shot he's laying down again.
Plot hole: When Debbie and Mike are in the pink cocoon room of the circus tent Mike yells, 'Joe Lombardo.' However, Joe Lombardo doesn't die until at least 4 scenes later in the movie, when a Killer Klown edges him off the road and over a cliff.
Other mistake: The Giant Killer Klown at the end of the movie picks up the Ice Cream truck and hurls it into the wall resulting in an explosion that destroys the entire car. The two ice cream drivers say that the way they lived was by hiding in the ice cream truck freezer. First, ice cream truck freezers cannot fit two people and even if they could, the car was blown apart from the back first which would have killed them instantly anyway.
Continuity mistake: In the police station, after the Klown squirts Mooney with the yellow flowers, Mooney says "So you wanna play games, eh?" If you look at the bottom of the screen, the flowers are still there, but then the the shot cuts to a wide shot, and the Klown's arm and the flowers are gone.
Revealing mistake: When Dave and Mike enter the area where the cocoons are stored, you can tell that all the rows above the main floor area, with the exception of the second rows near the camera position, are all matte paintings.
Other mistake: When a man destroys the clown's bike, the clown jumps away, and he says "Where'd he go" and the clown comes back with boxing gloves on his hands. There is no way for the man to not see where he went since he kept his eyes on the clown the entire scene.
Suggested correction: The clown jumped up into thin air and disappeared for a couple of seconds then reappeared. The clowns are from "outer space" so they may be able to travel at super speed when they want.
Revealing mistake: In the bathroom scene when Debbie is attacked by the clowns from the medicine cabinet, you can see the holes where the puppets are being controlled from.
