I did some diggin and these three tidbits might explain it;
*George Lazenby was the only actor to ever break the "fourth wall" of Bond movies and say he wasn't the same guy with his opening line, "this never happened to the other fella."
*Early drafts of the script had a subplot of Lazenby getting plastic surgery to explain the change in appearance.
And like you noted, on the order novels were written
*The producers tried to stay as true to the original novel as possible, explaining why Blofled didn't recognize Bond. The literary SPECTRE trilogy was Thunderball, On Her Majesty's Secret Service and finally You Only Live Twice.
If you want, you can lock and sink this baby in the bottom of the sea.
Edited by Blonde Bond, 18 August 2006 - 09:44 AM.