Is that impossible? Books don't have errata?
To my knowledge, no errata was issued for the 1980 edition of "Flim-Flam." Further, Randi's statement that "I've never even set foot on the sacred grounds of SRI" also appears in the 1982 edition. And, to my knowledge, no errata was issued for that edition either. But the main point here is that, when Prescott wondered on-line how Randi obtained his detailed knowledge of the SRI testing room when he had "never set foot on the sacred grounds of SRI," Randi chastised Prescott for arriving at such a conclusion. Prescott then cited the exact page of "Flim-Flam" that states that Randi had "never set foot on the sacred grounds of SRI." Randi still didn't explictly acknowledge the error, but mystifyingly responded: "Wasn't able to find that!"
So, the bottom line is that "Flim-Flam" contains a misstatement that understandably led Prescott to think that Randi had never been to SRI. Randi's reaction, however, was to chastize Prescott, rather than apologizing for, or even directly acknowledging, the misstatement.