Tuckerization: Jack Wade is named after uncredited screenwriter Kevin Wade.
What Could Have Been: Alan Rickman turned down the role of Alec Trevalyen. There was also talk of Anthony Hopkins playing role, with Trevelayan originally intended as having been a mentor/father figure to Bond rather than an equal.
A subversion from a previous example. Pierce Brosnan was originally chosen to replace Roger Moore as James Bond but wasn't able to get out of his Remington Steele contract leading to Timothy Dalton getting the part.