"Out of sight out of mind improved" certainly covers what, to my mind, is the one weakness in the original Vernon routine.
This is due to the addition of the four cards that are added to the face of the deck at the conclusion of the shuffle sequence which thereby avoids the possibility of the spectator seeing their selection on the face of the deck.
However, the method for adding these cards is in itself weak as the effect would be stronger if the deck were simply turned face up and the cards displayed without any arrangement of four extra cards after the shuffle.
Needless to say, I have a shuffle sequence that addresses the very problem of adding extra cards after he shuffle and also have an addition that, like Vernons original, does away with the need for the key card as was added in the "improved" version.
If I have enough interest I may send it to Richard for publication.