Ok, I've now seen the final scene on YouTube.
My intial take and I'm reaching here: the first moment Tony steps into the diner, he looks at the room... and the music playing is Little Feat's
All That You Dream, clearly signalling to me that this is not real-world reality.
After a cut back to a close-up where he's still looking at the room, it cuts back to him sitting in the room but wearing different clothing. This is not a continuity error and is probably the most significant moment of the scene.
What this strongly reminds me of are the final moments in
2001: A Space Odyssey when Dave sees himself in various stages of his dying/metamorphosis stages where time is compressed while expanding, and yet, the stages of identity are revealed to oneself... which kind of ties into the Buddhist monk slapping him across the face in a dream in an earlier episode.
The various characters coming through the door and the various shots of people in the restaurant... these are not assassins, but almost a respooling of various characters that we see throughout the entire series. The scout troop is how perhaps he saw himself. The cooks, a reminder of his cousin... the guy with the hat, the rat that gave him the painting.
The man going to the bathroom is clearly a nod to The Godfather, but it's only because in the first season or two, the main characters were obsessed about those movies, so it's not like this man shot Tony, it's more that Tony realises in his dying moments that so much of his life was modelled on what he saw played out in various fictional and non-fictional TV programmes and films.
So, my impression is, is that the scene in the restaurant is like Tony's life passing through his eyes, his true relationships with his immediate family are metaphorically revealed for how they truly are before he dies and we, the viewers die with him...
He's either killed the minute he steps into the restaurant, or he dies earlier in the episode, or he dies at the end of the preceding episode. This supposed final scene is a coda, a dying dream, not the last real-life scene.
My take anyway... I reserve the right to be wrong, because nobody knows nuthin'.
