This episode was a backdoor pilot for a proposed series. It would have been entitled "Turnabout" and was to have starred Hugh O'Brian in his first non-Western series, but CBS passed on the project.
The shots of the funeral procession for "Oskar Wolny" are actually composed of stock footage of the 1952 State funeral for King George VI of the United Kingdom.
Mason was made to appear to be onscreen with Bruce Jason, although they are never in the same shot. His interactions with the other fill-ins were just through the phone.
The circumstances of Wolny's death as described in the episode seems to be a conflation of the 1948 demises of the two leading lights of Czechoslovakia, President Edvard Benes (who died suddenly trying to moderate the rise of Klement Gottwald's Communist government) and Jan Masaryk, Czechoslovakia's non-Communist Foreign Minister, who was found dead outside his third-story window. The Communists claimed it was suicide (though some wags said that Masaryk would have to have been a very tidy man to have shut his window after jumping from it) while other investigations claimed death by misadventure or deliberate murder.
The amusement park setting was a nod to the debacle surrounding Soviet premier Nikita Kruschev's not being permitted to visit Disneyland in 1959.