According to Claude Zidi, the character Tricatel was inspired by Jacques Borel, a French industrialist who in the 1960s had the concession for roadhouses at French highways.
Call an Ambulance!
Marguerite #1: But my leg is broken!
Charles Duchemin: Good thinking call an employment agency i'l have to replace you
When the two Duchemins have infiltrated Tricatel's factory and the shovel from the crane goes back up in the air, you can hear the motor sound of the crane as if they stood right beside it. However, the crane stands way outside the factory.