We rewound it twice, but I still swear I saw Ben Affleck in the background.
When Larry was in the clothing store at the start, and the fire alarm goes off, the clerk is trying to herd Larry out, and several customers start walking towards the door. The tall guy with the beard, is the spitting image of Ben.
He had no lines and I never saw him again, it was just a quick 5 second walk through! I swear!