I mean, if you have a reputation of being an a*hole and your behaviors were corroborated by multiple sources (including his co-star's diaries), then you can't be surprised when Karma gets your number and gives you a call. I do question that if Shaw reached out, it might have been possible that Dreyfuss could've pulled a cease-and-desist for use of his likeness.
I also wonder that if Dreyfuss had come out earlier saying anything about the play, it would've had the Streisand effect and driven more people to see the show. In either case, this play has been circulating around for years and I can't imagine that he didn't have some awareness about what it might've contained.
Sidebar: Due to his alleged difficulty (although some attributed it to an injury), Dreyfuss left the West End run of THE PRODUCERS and is the reason why Nathan Lane has an Olivier Award on his shelf.
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Is anyone interested in staging the play if Ian Shaw isn't starring in it? Getting to watch Shaw play his father is such a huge factor in why the play connected with audiences, to the extent it did.