The moment he drives Diana into temporary safety, he is trapped into a nightmare scenario where the SAVAK agents track them throughout the city; a Frenchman, Melville (Roger Vadim) and his henchman (David Bowie) try to kill them; while Diana's brother, an gay Elvis imitator, is completely indifferent to their survival. Landis somehow balances all the blood-letting with wit and humor as Ed and Diana incredulously manage to outwit and outrun the evil forces attempting to destroy them.
Much like early film comedians such as Buster Keaton and Charlie Chaplin, there is a complete innocence, almost an idiocy about Ed, that both saves him (and Diana) and gradually transforms him into a kind of loveable fool.
Before Ed and Diana have even had time to recover from these new circumstances, FBI men whisk them away, as the couple fear another kind of arrestment. Landis returns to humor as the FBI agent dumps a suitcase of money before them upon the bed: it's all theirs. Which, in the director's cynical view, is slightly contradicted as the agent picks up several packages of bills, stuffing them into his own pocket. "Who's gonna tell?"