Visible crew/equipment: During the The Pitch, a crew member is visible after they sing "elephant, Bohemians, Indians, and courtesans...". He can be seen wearing a green/gray baseball cap, pushing the bald man who is hanging on the chandelier.
Visible crew/equipment: When Nini is doing the dance to Roxanne, you can see a very visible cameraman when one of the male dancers lifts her over his head. If played in slow motion, you can see that the spotlight even focuses on the cameraman for a split second.
Visible crew/equipment: When Satine is singing 'One day I'll fly away,' she goes up the steps to the top of the elephant. If you look to the top windows of the building behind her, you can see a strange shape gliding past the lit windows from left to right. I'm not sure what it is, since it isn't the shape of a person and it looks like it's on a track. Then when Satine sings, 'Why live life from dream to dream?' the shape goes back from right to left, and at the last second, before it cuts to Christian, the lights go out. Now, I've seen the behind-the-scenes of footage of Moulin Rouge, and that scene was probably behind a blue screen so I haven't a clue what the shape is.
Answer: The way I saw it, that was Toulouse in present day singing, after the death of Satine etc.
He's a funny little man who is lonely himself. All he has is his bottle when everything is all said and done. He has nobody.