There's a scene in Mandoras where a small airplane circles and then lands in order to drop off an Army general. The tail number (registration number) is visible in one of the scenes (N4328C). Upon researching it, that airplane, a 1955 Aeronca Champ 7EC, is still flying as of 5/13 and is based in Modesto, CA. However, as of 5/13 it's for sale.
"They Saved Hitler's Brain", despite bearing a 1963 copyright, was released years later. The 1963 film The Madmen of Mandoras (1963) was combined with new footage of "CID" agents Vic and Toni shot for the film and released to television as "They Saved Hitler's Brain". The Vic and Toni footage was clearly shot years later; the hairstyles and fashions did not become popular until the late 1960s.