I found a revised text picture cover of Hollow Oak with blue multi endpapers.
The book meets the points for the 1972B-68 printing according to Farah's 12th edition.
This printing is the introduction of the 1972 text and third cover art. It matches all points in Farah's Guide, including the two blank pages at the end (bl/bl) just before the endpapers. The book has blue multi endpapers, which is what got my attention. Normally, the books switched to the black and white multi endpapers when the text was revised.
I already have the same printing in my collectionor so I thought. This book has the black and white multi endpapers, unlike the above book.
The book does not have the extra blank pages at the front and the back, which means its points would be listed like this in Farah's Guide.
The above points match the 1972A-67 printing, except that the book should have the original text and second cover art. Since this book has the revised text and third cover art, it should be the 1972B-68 printing, but the missing blank pages make it a mismatch.
I found another book that is identical to the one mentioned in "A Nancy Drew Revised Text PC with Blue Multi Endpapers." The book I just found is identical to the one pictured in that post down to every point.
I found a Haunted Bridge PC listing to Mirror Bay with reversed black and white multi endpapers.
The left and right endpapers are each on the wrong side. The rear endpapers are also reversed.
I found a Bungalow Mystery listing to Crooked Banister that has the black and white multi endpapers. This would not seem odd, except that I'm pretty sure that I normally see blue multi endpapers on all of the revised text Bungalow Mystery books up to 1973 printings. I checked several books in my possession, and I found blue multi endpapers.
Farah's Guide has never noted which endpapers are present for each specific printing, except for earlier formats. I am discovering that much is unknown about the endpapers for the revised text picture cover books.