Deux Deux quotes from a famous line Lauren Bacall said in "To Have and Have Not," about whistling.
The inspector answers a black rotary file wall phone, the standard telecommunication device at the time.
The plot is very similar to Tree for Two (1952), with The Inspector as Spike, Deux-Deux as Chester, The Sailor as Sylvester, and The Ape as the panther.
The title is a play on the French dessert Crêpes Suzette.