Revealing mistake: There is a shot where the point of view of the camera is looking down at Christian and Toulouse from the opening in his ceiling. You can see John Leguizamo's legs behind him and that he is kneeling down. (00:06:00)
Revealing mistake: Throughout the movie, if you listen closely to Ewan when he whispers, you can hear that his accent switches from English to Scottish.
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.