Watch the first 7 minutes of this video for comments on minor changes to the schematic and board layout:
I don’t know if editions later than the 4th printing/1st edition that he’s using have these things corrected.
Don Lancaster came out with “Son of Cheap Video” not long after, so I imagine more attention was paid to that than to fixing the original book.
I thought I recognized Martian Tech’s hand and adjustment tool there. 
He has a pretty great set of videos on building a DG Nova-compatible computer using the Fairchild 9445 CPU, too:
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