When the password is "HARP" Desi Jr.'s clue is "MARX", evoking Harpo Marx, who made a guest appearance playing his namesake instrument on an episode of "I Love Lucy."
In the final round, the password is "CARROT" and Desi's clue is "RED." He was probably thinking of his mother's hair, not the vegetable.
All their winnings will go to a summer camp for underprivileged children.