Who is the man on the stairs? 🤔

I always took it as it's not really a specific character but it's someone who can recognize an awkward situation so he bailed the fuck out 🤣

Uncle June no doubt

Considering that we see several ghosts throughout the episode, the one near the ambulance, then Pussy, this gentleman. I'm guessing its, young Junior, one of Paulie's victims or someone else haunting someone in the room. The show hints to the supernatural a number of times.

A rare Harpo sighting.

I always believed it was the ghost of Johnny Boy, making an appearance at Livia’s wake.

Ercole Soprano

The ghost of Brendan Filone

It was one of the ghosts from the Overlook Hotel