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The Missing Witness= Possible Goof

Possible spoiler-

In this episode SOS in Morse Code is used; yet I believe the time period it is set in predates use of the SOS signal.



Sending an S.O.S. would've been impossible without the radio to transmit it.
S.O.S. was introduced in 1905 by the Germans and was adopted internationally
as a radio distress signal the following year, 1906. How the Water Man would
know it from prior army service is even more unlikely than Carrados knowing it.