A viewer more astute than myself has posted this elsewhere...

"The guy at the bar is also credited as Nikki Leotardo. The same
actor played him in the first part of season 6 during a brief sit
down concerning the future of Vito. That wasn’t that long ago.
Apparently, he is the nephew of Phil. Phil’s brother Nikki Senior
was killed in 1976 in a car accident. David Chase is truly rewarding
the true fans who pay attention to detail.

The trucker was the brother of the guy who was robbed by Christopher
in Season 2. Remember the DVD players? The trucker had to identify
the body. The boy scouts were in the train store and the brothas at
the end were the ones who tried to kill Tony and only clipped him in
the ear (was that season 2 or 3?).

There were three people in the restaurant who had reason to kill
Tony...”