That is news to me. But his father Carl, was a great comic actor in the 50s and 60s. I would say that Carl was more famous as a comedian than Rob , but Rob was a great director and producer. His acting career was pretty much limited to playing Archie Bunker’'s son on ‘‘All in the Family” which was game changing TV in the states from the late 60s to early 70s. I probably watched every episode.
Over the years he has often talked about it and how nervous he was with his mother there! She plays it beautifully dead pan.
From Reddit:
Nora Ephron wrote the original deli scene without any orgasm talk. But then in discussion with Rob Reiner and co-producer Andrew Scheinman she told them that most women sometimes fake orgasms, so Rob and Andrew wrote a conversation about fake orgasms and added it to the scene in the script. And then Meg Ryan came up with the idea of them not just discussing it, but Sally actually faking one aloud in the restaurant. And then Billy Crystal came up with the final “I’ll have what she’s having” punchline.
Here’s what Ephron wrote in her intro to the published screenplay:
And much as I would like to take full credit for what Sally says in the movie, the fact is that many of her best moments went into the script after the three of us began work on it together. “We told you about men,” Rob and Andy said to me one day. “Now tell us about women.” So I said, “Well, we could do something about sex fantasies.” And I wrote the scene about Sally’s sex fantasy. “What else?” they said. “Well,” I said, “women send flowers to themselves in order to fool their boyfriends into thinking they have other suitors.” And I wrote the scene about Marie sending flowers to herself. “What else?” Rob and Andy said. “Well,” I said, “women fake orgasms.” “Really?” they said. “Yes,” I said. There was a long pause. I think I am correct in remembering the long pause. “All women?” they said. “Most women,” I said. “At one time or another.”
A few days later, Rob called. He and Andy had written a sequence about faking orgasms and they wanted to insert it at the end of the scene that was known (up to that time) as the andirons scene. He read it over the phone. I loved it. It went into the script. A few weeks later, we had our first actors’ reading, and Meg Ryan, who by then was our Sally, suggested that Sally actually fake an orgasm in the delicatessen at the end of the scene. We loved it. It went into the script. And then Billy Crystal, our Harry, provided the funniest of the dozens of funny lines he brought with him to the movie; he suggested that a woman customer turn to a waiter, when Sally’s orgasm was over, and say: “I’ll have what she’s having.” The line, by the way, was delivered in the movie by Estelle Reiner, Rob’s mother. So there you have it—a perfect example of how The Process works on the occasions when it works.
A very sad thing happened last night in Hollywood. Rob Reiner, a tortured and struggling, but once very talented movie director and comedy star, has passed away, together with his wife, Michele, reportedly due to the anger he caused others through his massive, unyielding, and incurable affliction with a mind crippling disease known as TRUMP DERANGEMENT SYNDROME, sometimes referred to as TDS. He was known to have driven people CRAZY by his raging obsession of President Donald J. Trump, with his obvious paranoia reaching new heights as the Trump Administration surpassed all goals and expectations of greatness, and with the Golden Age of America upon us, perhaps like never before. May Rob and Michele rest in peace!”’
Well, at least he got an RIP at the end…could have been worse.