It isn't exactly an homage, but I'm sure we all realized that, in the last scene, the "new" offices for Moneypenny and M are exactly like the old office from the Connery-Moore-Bernard Lee-Lois Maxwell days. Right down to the hat rack by the door and the leather-padded inner door to M's office. Far more traditional than the ultra-modern offices from the past few films.
And again, not exactly an homage, but the "new" M looks an awful lot like a young Bernard Lee - his hair and his three-piece suit. And Moneypenny's dress at the end is very much in the style of the 1960s - exactly the kind of thing Lois Maxwell would have worn in the Sean Connery films.
So we've come full circle.
Excellent post! Loved the leather-padded door and basically the same layout of the office as during the Lee/Brown M days.
I'm surprised though that a few of the most obvious references have not been mentioned yet:
Bond's fight on the train (along with him hanging off the side of it) right out of Octopussy.
Bond in the crane, a nod to Bond killing Blofeld (at least we think) in DAF.
Bond tells M to "get in" his car. This line was used several times in QOS and once in LTK.
And the most obvious nod:
Silva, a former MI6 agent that has been corrupted and is now out for revenge, just like Alec in GE.
It's funny how NSNA hommages always creep up for anniversary films. DAD had the whole bar on the beach scene from NSNA reproduced verbatim.
Very good. Forgot about that one! Though it can also be a nod to DN just before Felix introduces himself.