Here's my outre Ask BK question:
I started watching the 1953 (1952?) Prisoner of Zenda last night and was amazed to see the "two" Stewart Grangers actually touching each other, something I would have assumed the SFX capabilities of the early 50s would have precluded. For example, when they meet, they shake hands. Later, in the drinking scene, the King pats the commoner on the arm. Now on the second one I guess they could have used a prosthetic arm, but I am really curious how, with the technology available in the 1950s, they got the handshaking scene. Both versions of Granger are clearly seen, it's a medium close-up, and they quite clearly shake hands--I replayed it several times. Do you know how that was accomplished?