Significance of Last Scene?

I always thought it was just a waiter and that Newton had had enough of earth as well. I didn't think that the waiter had any links to the government. The government was through with Newton--he was now a hopeless blind drunk with some of his fortune left but unable to return home or even help himself pick up a glass. He'd definitely had enough of everything at that point. The rest of the last scene is interesting, too. After he drops the glass and the waiter says the line, the music of Stardust by Hoagy Carmichel comes on and the credits roll--many reviewers have said the end music has two meanings. Of course, the obvious one--Newton comes from the stars so Stardust is appropriate and the second meaning--Stardust is a reference to the fact that Bowie played Newton and also played the famous persona named Ziggy Stardust.

I just watch the Criterion Collection version of the movie and it seems to me that he is not blinded by the xrays but instead the "contact lens" are now permently attached to his eyes and can no longer be removed. It the scenes after the xray it looks like he is able to pour his drinks and drop in the ice cubes without missing the glass. Also he looked like he could see when he escaped were he was been held.

The book and the movie are different things.

Goo Goo G'Joob

I thought that grog didn't effect him the way it does humans? So he had become an emotional cripple. When the waiter says he has had enough he thinks he is drunk but he isn't. He has given up.
Also, the last scene very much goes back to the conversation that was had during the ping-pong game about what he had on his own planet. The last scene was saying that on earth we have all these things but we don't love each other.

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Couldn't he just have been paranoid and that's why he looked at the helicopter that way?

Also, do you notice how Bryce points his finger at Newton as the helicopter hovers over? I take this as Bryce's signal that he found the man they are still watching. It's Bryce's final betrayal.