Many locals were used in the making of The Blob. However, director Yeaworth was severely criticized for his lack of control over the extras. Case in point…
This classic scene shows the moviegoers running out of the theater after the Blob ate the projectionist and started oozing into the main theater area. If you look, you’ll see that most of the extras were really enjoying themselves, as indicated by the huge smiles on their faces.
Pay particular attention to the couple at the center of the picture. The woman in the pink dress and the man in the white shirt are running off to the left.
This next picture appears in the movie just a few seconds afterward.
The same couple is exiting the theater and now running off to the right. But they’re still obviously having a good time.
Many of the extras used in this scene were from St. Pius X in Pottstown and Phoenixville High School.