Connery was in fact on board to return for LALD, however he was fired after his first day of shooting, because no one could take him seriously every time he said "Sholitaire".
Whilst Blofeld appeared in drag in DAF, he nearly did before hand; the scene in OHMSS where Irma catches Bond by lying in bed was originally supposed to see Telly Savalas in wig and nightgown.
Desmond Llewlyn was only bought back after Q's absence in LALD when he told EON "If it hadn't been for Q branch, your franchise would have been dead long ago".
Denise Richards auditioned for the role of Elektra King. Somehow, nuclear expert was the more realistic role for her.