Jerry: I am big, it's the bootlegs that got small.
Near the end of the episode Jerry is told that he used to be big in bootlegs. He responds as stated above. This is a direct reference to the 1950 film "Sunset Blvd."
Joe Gillis (William Holden): "Wait a minute, haven't I seen you before? I know your face ... you're Norma Desmond! Used to be in silent pictures. Used to be big."
Norma Desmond (Gloria Swanson): "I am big. It's the pictures that got small."