I just finished reading Carol Channing's book "just lucky I guess" (2002). It is understood that appearing on Broadway 8 times a week demands complete attention. But, Carol claims she was totally surprised when Ethel Merman said, "Yeah, I turned that show down," when asked if she had seen "Hello, Dolly."
Carol writes, "And I found out years later she did indeed, but I suppose, naturally, nobody ever told me."
When Merman finished the "Hello, Dolly" run on Broadway, Ms. Channing claimed that Merman said," Nope, no pictures. Not wit' Carol."
It'a very strange book, but I do not want to go beyond the quotes concerning Dolly.