When Ewan McGregor is walking away from the stage at Spectacular Spectacular he drops his coat on the floor and keeps walking. Although when he turns around and faces the stage again you see the aisle and the coat is gone.
Yes but if you look closely, we don't actually see the whole coat fall to the floor, we just have the shot of Christian taking it off and then it sort of hangs from his arm. The camera then turns back to Satine and Zidler (or whoever it goes back to!). This could mean Christian threw the coat somewhere (hey I know it sounds stupid but it could happen!).