Chuck Russell and Frank Darabont didn't have a lot of rules for the blob, but they agreed the general concept of the creature was it being an inside-out stomach meaning the acid is burning, melting, and devouring almost everything it touches.
Chad McQueen was offered the part of Brian Flagg but turned it down. He did so due to disliking the script...and to having a strict personal policy of never performing in any production based on, or inspired by, his actor-father Steve McQueen's work.
Chuck Russell is a big advocate of storyboarding shots in advance. "When I first came to California, I gate-crashed Universal when Hitchcock was still working, went into Hitchcock's office, said I'm here to see Mr. Hitchcock, and I could see him working with a storyboard artist."
Donovan Leitch Jr. (Paul) took Shawnee Smith (Meg) to his senior prom at Hollywood High. He wrote her a thank you note afterward, which she kept for years. They later appeared together in this film.
Of the film's $19 million budget, $9 million went toward visual effects.
Chuck Russell: As a theater patron in the second row, left of center, during the wide shot of the theater audience reacting to an on-screen fright.