Factual error: One zombie, who's rotted away all his organs, has two eyeballs looking good as new. Even if eyeballs didn't rot, they would fall out with nothing to hold them in. Just like the half of a woman zombie that talks with a soft sultry voice but with rotting or missing vocal cords.
Factual error: At the beginning of the movie, we find out it's July 3rd, 1984. Burt tells Freddy and Ernie to have a good 4th of July weekend. July 3rd 1984 was a Tuesday.