ok i watched again this is what i caught
-putting sign on guys back
-sitting on car when brad arrives to school he's got a red backpack
-standing w/ brad when arnold approaches about a job while stading in line
-buttering a bun() at all american before brad is cleaning "big hairy pussy" of the mirror
-looks up at camera when the customer is wanting the 100% garuntee
-pops up and cheers in crowd at football game

but i also remember another quick flash of just the back of his head flipping burgers i didn't catch it this time