Major character who has only appeared on 1 page in the entire OOTS saga

[lio45]

That leaves only two actual appearances on two pages directly after each other; it's entirely reasonable that Rich blurred them together into one in his head.

I disagree. When someone clearly states the number in letters and then takes the time to re-state that same number as a number in parentheses, you can be sure that they're not eyeballing the number in question.