Factual error: In the WW1 1918 flashback, radio equipment is shown that is majorly anachronistic. Reel-to-reel tape recorders didn't exist until the late 1930s (German Magnetophon). The radio equipment again resembles WWII sets like the British Wireless Set No. 19 or U.S. BC-312—decades newer than 1918 spark-gap transmitters or Marconi S.F. transceivers. Small indicator lamps and enclosed metal chassis also point to WWII/Cold-War tech.
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