Continuity mistake: When Barris is in his office reading a newspaper article, his secretary tells him over the intercom to pick up line one. Keep an eye on the Variety paper laying on his desk. In the very next shot, a pencil magically appears on top of it.
Factual error: In the first shot in Helsinki, there is a yellow 4-door saloon car in the right background. It's too far away to identify it precisely, but it's about a 1980 model, something like a Ford Taunus or Toyota Carina - this scene is set in 1957.
Factual error: In a shot in which Barris is on the phone in the sixties, the phone has a modern plug on the handset.