In a flashback scene to the first movie, Melvin smashes out a window and into a barrel of toxic waste. The window changes in damage.
After Toxie first enters the video store, a few VHS tapes on the adjacent shelf disappear.
The amount of destroyed VHS tapes on the shelves appear and disappear in between shots.
The VHS tapes continue falling on the extras, even after they've been shot.
The girls at the bottom of the Apocalypse Inc. staircase appear and disappear inexplicably.
When Sarah picks up a dust ball and absorbs it using her sight for the first time, the concrete scrapes - even though she's wearing gloves and the way she scrapes it up is rather gentle.
A few of the VHS tapes that have been shot are dangling from wires.
In a flashback scene to the second movie, Toxie crushes a guy's nose into a fish; no smoke comes out from the taiyaki mold clamps in one shot.
The VHS tapes are clearly empty cover sleeves.
Toxie's right eye seems to be slightly bulging from its socket.
During an extreme close-up of an elderly woman remarking: "The Toxic Avenger is coming!", she slightly fogs up the lens on the camera.
When Toxie arrives at Apocalypse Inc. with his resume, he speaks but his mouth doesn't move.
The screaming in the Video Store.
(around 50 min.) After Toxie cuts the ribbon to open the landfill, the employees cheer and applaud - but there's no sound of clapping.
(around 37 min.) Cigarface's dictation before Toxie's arrival.
(around 43 min.) As House evictions by Apocalypse Inc. occur, the reflection of a van is visible on a home's window - with its side door open, revealing a cameraman - driving by and filming the establishment shots.
(around 37 min.) When Toxie the Chairman first arrives for his speech, the cameraman, camera crane and crew are all reflected on the limo.
When the Devil drives the bus through the potluck, the camera's reflected on the windshield.