Other mistake: As the brown truck drives away in the scene after the man working in the newspaper office is "harpooned" by a Critter, if you look closely as the truck turns a corner you can see some Critters rolling after it. Well, after they roll past the truck in the bottom left of the screen you can see the Critters roll right smack into another parked car. Obviously the crew forgot to add a turning feature to their Critter balls (which were just some fur taped to a basket ball).
Other mistake: We know that the blob dissolves flesh and hair and that it can also burn wood (since fluid coming from the blob burns a small spot on the desk in the hospital) and that it can dissolve bullets, but despite this obvious acidic state, the blob doesn't dissolve plants, walls, glass, concrete, metal, nor sticks and twigs.
Suggested correction: It can control its functions otherwise it wouldn't be able to exist.
Other mistake: When Lea Jansen and Dave Ryder want to leave the room, which is called the "deep freeze", they hear Kalgon and his men coming and "hide" next to the door. When Kalgon and his men enter, the movie wants to tell us that they cannot see Lea and Ryder, although they are obviously in their field of view.
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.
Other mistake: During the first volley from the laser satellite, Kaneda is less than 30 meters from Tetsuo. A massive explosion and fireball hundreds of meters wide is shown within seconds, but somehow, Kaneda survives despite close proximity to the blast. (01:36:00)