Anniversary Refinements?

In GREGG SPEED BUILDING, 1929, I've found a couple of words which aren't written correctly or, at least, the way I write them (and my Anniversary dictionary writes them).
Is anyone aware of system refinements which may have occurred?  Were there problems with transcription, resulting in the use of alternate forms in later printings?  Are they just publishing errors or are they pre-Anniversary outlines which crept into the text?
I can only find four examples now.  (Of course, I didn't note them when I was finding them the first time.)
Does anyone have THE explanation?
(See what happens when you try to do a good theory review?)

(by shorthandmarc for everyone)