Spiderlegs' name in misspelled "Spiderless" in her file.
After Slimer presses the trap pedal, the trap is seen in close-up and is no longer attached to a cord, yet it still works.
When Slimer adjusts the ghost's hot tub to the highest setting, the dial says "Pupee" likely meant to be Purée, as in to liquefy.
When the Exto-1 enters the firehouse, it's license plate reads "Acto" instead of "Ecto".