Going into this episode, I knew that there was "a shocking surprise ending." So when Eugene Pontecorvo is revealed to be working with the FBI, I said to myself, "Eh, that's not that big of a twist." And then when he killed himself, I thought that had to be what I'd heard about and I said to myself "Eh, that's not that big of a twist." And then Uncle Junior shot Tony and I said, out loud this time, "What the fuck?"
Color me surprised. It was a hell of a moment. The show had spent much of this episode and the last couple of Season 5 to suggest that Tony's days might be numbered. Frank had a legitimate beef with Tony that didn't seem likely to be settled easily. Johnny Sack himself didn't seem too enamored with his New Jersey counterpart. Chris continued to run hot and cold on his uncle. Silvio openly talked about dissension in the ranks. Eugene himself seemed back into a corner with suggestions from more than one corner that he could bump off Tony, and even Vito talked about his possibly becoming the boss of the family.
Instead, it was a man with dementia who believed that he was taking out an intruder or Pussy Malenga or something along those lines in an almost random occurrence. That's often the way in this show -- when everything is looking to build to some expected confrontation, the unexpected, even mundane happens to throw it all into chaos. (See also: Richie Aprile.) There's a sense that David Chase and his colleagues are quite conscious of this episode as the beginning of the final season, with a number of callbacks to early episodes. Junior's obsession with Pussy Malenga (the guy he wanted to knock off at Vesuvio in the show's first episode), and ending up killing the nephew who stood in his way, is a nice little feint toward that opening entry, as is Tony's refrain of "it's a nursing home", in a flip on his usual response to discussion of the retirement community and his mental retcon of what happened with his mother and that pillow.
The episode also draws a number of contrasts between Tony and Eugene, and in a larger sense, between the Sopranos and the rest of the world. Tony and Carmela are enjoying sushi every night and buying expensive cars as apologies. Other folks are feeling the pinch. Even Eugene, who inherits 2 million, can't get away. In many ways it's an episode about the big guy and the little guy. Tony can throw his weight around, he can make choices, live lavishly, at the expense of those around and affected by him. Eugene, even with money, doesn't have power, and that means that everyone from Tony to the FBI can toss him around without his having any say in the matter.
It's also about that difference between money and freedom. When Carmela shows up to Ginny Sack's home, ostensibly for a spa day, but mostly to show off her new porsche while Ginny is having money trouble because of her husband's indictment, it's a little more of the haves rubbing their success in the noses of the have-nots. But when she tries the same with Angie Bumpensero, and Angie reveals that she bought herself a corvette instead, Carmela is taken aback, and is again reminded that her wealth does not give her the independence she once so sorely sought.
And there's also an idea of death as the great leveler, no matter how low your are on the totem pole or how high you've climbed. When Eugene hangs himself, the camera doesn't cut away to spare us his suffering. Instead, it lingers, and the audience sees Eugene kicking frantically, gasping for air, until he finally collapses after a few final twitches. It's incredibly uncomfortable to watch, but underscores the unpleasantness of his position that this is preferable to going on. But then the show pulls the same trick once more. A different show might have ended simply on Junior shooting Tony and Tony collapsing to the ground. Instead, it stays with Tony as he agonizingly pulls himself across the room, struggles and strains to dial 9-1-1, before passing out from blood loss. Tony and Eugene may be at different stations in life, but when it comes to the throes of death, the type of suffering that may be visited upon a person, Tony's money and power can't stop it anymore than Eugene can.