Which is not "in accord" with Solow's account. Leaving after a morning of shooting isn't the same as "the morning he was scheduled to begin work."
"HERB: ...the morning he was scheduled to begin work, November 16, 1966, John Drew Barrymore disappeared, ignoring his role, his moral obligation, and his contract."
It is in accord. You can't disappear unless you have first appeared. Brown's "after lunch" phrasing might be incorrect, but both accounts indicate that Barrymore reported to the studio that morning. Both accounts might be wrong, of course; I wasn't there.