The villainous "Aram Rodesko" seems to be based on Aristotle Onassis (although the similarity of his fiancee to Jacqueline Kennedy is almost certainly coincidental - Jackie O. did not marry Onassis until 1968). "Colin Lassiter", the reclusive Australian billionaire whom David Niven's character impersonates, bears a certain resemblance to Howard Hughes, given his extreme dislike of being photographed, his habit of using pseudonyms and some other eccentricities - although he has a good deal more savoir-faire and personal charm.
Closing credits: The characters and events in this photoplay are fictitious. Any similarity to persons, living or dead, is purely coincidental.