While shopping for the waiters' uniforms, Larry mentions to Jeff that he was in the military years prior. Larry David actually served in the Army Reserve during the Vietnam War.
Larry's idea for bells on tables to summon waiters in restaurants is now commonplace in many restaurants in Spain where doorbells attached to the tables ring with their own tone to the corresponding table number in the kitchen.
The man in the picture (Chet) is actor Michael E. Perry.