I couldn't see a thread for this and honestly when it comes to symbolism I'm a little bit obsessed at finding all the nods and things like that.
I thought we could use this thread just to note down everything we noticed throughout the movie and have it stored in one place. Could also be cool for some discussion (what is too big a leap of logic. What is not)
Please note for those that haven't seen this movie yet, this will contain major spoilers.
this may be one for you as well as I noticed you were having a crack at this in the spoiler threads too.
So the one I thought of today and to start off... as a potential symbol:
In Greek mythology, Heracles is eventually driven mad and accidentally kills his wife and children which I think was interesting given the context of what happens at the end.
Or in the titles:
The use of Britannia who is being broken, the literal personification of Britain, and then Bond literally being used as Britannia's trident on Q's screen for the mission into Safin's lair.
Then of course, there's other little things such as the call back to CR.
The last line in CR is "Bond. James Bond." The last line in NTTD is "Bond. James Bond." A nice little full circle and call back to the movies.
Finally, also the easter eggs, of which there are many... e.g.:
The DB5, the V8 Vantage, Skyfall's bulldog ornament, the paintings of previous M's.