Psyop Mistakes?

The mistake was probably made by confusing one of the two variants of 's' that were used back then with a 'f': The one that looks like an f was only used at the beginning of words, also within compound nouns. In this example, one would read as "guardroom", the other as "wax tube" http://de.wikipedia.org/wiki/Datei:Wachstube.svg