The other issue that everyone raises, but was ignored at the time, is that with a typewriter, you manually hit "return" after every line. Not only was there a font issue with this document. It managed to have line breaks
exactly where MS Office put them. Real humans are not that precise or regular when using a typewriter.
Of course if the forger had only used Courier as a font, he might have gotten away with it.
With Mapes, I keep thinking of Scooby Doo and, "I would have gotten away with it if it weren't for those meddling kids."