Art split apart Allie's right hand down below the wrist, but her hand and wrist are clearly intact when she is attempting to crawl to her phone.
Art clearly removes sections of skin off of Allie's back but when she is crawling on the floor, there's only blood smeared across her back with no skin missing.
The morning after the fire, Sienna's hair is nicely straight. When she's at school it's wavy like natural texture. Then at the shop later in the same day it's back to straight.
When Art attacks Brooke, he breaks her knee; but later, when he knees on her, both knees can be seen intact.
When Art kills Barbara, he shoots her head off her body. Shortly afterwards, he sets Barbara off at the table and it's clear that her head is still attached to her body (e.g. when Art stuffs food into her open head).
Art's favorite acid is fluoroantimonic acid he has in a clear glass bottle. It is a superacid capable of dissolving even glass.
The events of the first Terrifier movie are referred to as Miles County Massacre. This is a fictitious county, but the cops who arrived at the the carnage site wore NYPD insignia. However, the location is not explicitly mentioned in the first Terrifier movie.
When Jonathan is reading about Art on a web page, a paragraph begins with 'Without further adieu".
As the actor playing the Truant Officer starts to turn to leave after talking to Sienna's mother he looks at the camera.
The morning after her dream, as Sienna is drinking her coffee, a little gets spit out and she does a quick check to see where it went.
The Little Pale Girl is shown watching a live broadcast of a local news program on a small analog television with an antenna. The transition to digital broadcast for all U.S. television went into effect 14 years earlier in 2009. Therefore, it would not be possible for the analog television to pick up a live broadcasting signal without a digital box.
Because of the transition to digital broadcast in 2009, it would not be possible for the TV to pick up a signal.
Because of the transition to digital broadcast in 2009, it would not be possible for the TV to pick up a signal.
During the news report on the Miles County massacre, it is mentioned that the body of Art the Clown disappeared but no mention is made of the murder and mutilation of the doctor in the morgue. It's not clear what the police ever did about the latter murder and its connection to the disappearance of Art's body.