When the Duke has discovered Satine and Christian's secret love he demands that the ending is re-written. Through this see behind the Duke there is a man standing with a donkey behind him. You can clearly see the donkey appearing and disappearing though out the scene.
This is a slipup...but it's not a donkey, it's a horse. They were gonna hev the evil maharajah ride across the stage on it in the play "Spectacular Spectacular" but later decided against it. However, the still appears fleetingly in one shot...which is what you were talking about. Good job!
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