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: The Blob hates the cold - it backed out of the freezer and it backed away each time someone blasted it with a fire extinguisher, but it enters a theater's air conditioning system with the air on at full blast this should have made the vents too cold for the blob to continue further.