During a September performance of "The Phantom of The Opera," there were tons of mishaps in Act One.
The boat ran into a candelabra during the title song.
After Hugh Panaro and Rebecca Pitcher had stepped from the boat at the end of the title song, the boat nearly ran Hugh down. Later, as he was about to remove his cape, the pole swung free from the boat and hit him in the back.
He was having a rough day off-stage, too.
Then, at the first unmasking, Rebecca dropped the mask on the floor by Hugh's feet. As he jumped to chase her in that scene, he had to step clear of it and ended up falling hard instead of the usual staged fall at that point. There was no real way to retrieve the mask and he had to ad-lib the scene from there.
http://www.hugh-panaro.net