I once heard Illeana Douglas at a TCM event say how she when she was very young she once ran into some woman who was in The Dresser in a bank and she said to the woman "I was there the night Tom Courtney forgot his lines and left the stage to get them. And the woman said sarcastically, which one of the nights that?"
Implying there were many.
(I didn't quite get the quote right. It was very a very funny story when Douglas told it. I didn't quite capture it!!!)