A plot device is borrowed from
The Black Windmill (1974). In one film
Michael Caine's son is kidnapped and to get the ransom (uncut diamonds) he impersonates his boss (
Donald Pleasence) on the phone and gives himself permission to take the diamonds from work (MI5). In the other
Billy Crystal's ex-wife is kidnapped and he impersonates his boss ('Dan Hedeya') on the telephone to give himself permission to take the ransom (cocaine held as evidence) from work (Chicago police department).
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