After Robert drinks water from the sink and licks butter to cool his mouth, his shirt stays clean. However, when he goes back into the living room, a stain has appeared on his shirt.
Ray puts many ingredients on a cracker, one of which includes Tabasco sauce. He mentions how it's old because it was the bottle issued to Frank during the Korean War. Tabasco was first issued to U.S. Military in the 1980's, and in a much smaller bottle.