An FBI agent listening to audio surveillance of Albert Einstein writes notes dated August 4, 1947, at the same time Albert's son Hans tries to call him about a telegram notifying them of the death of Mileva Maric (first wife of Albert Einstein and mother to Hans). She actually dies exactly one year later on August 4, 1948.
The plot places the death of Frieda Einstein (wife of Albert's son, Hans) as 1947. Frieda actually died in 1958.
The autopsy pathologist dictates his notes onto a 7-inch Edison Diamond Disc, a format introduced in the late 1940s. not a modern 4.7-inch compact disc as it might appear at a glance.