I like to think I'm pretty easy going.... and that everyone makes a mistake sooner or later, or email can fail....
Either way I'd email them first with the proof saying they'd made the mistake and advise them to ask me first personally before taking it public (after all, that's what I would do to someone else). I'm not big on calling someone out with the big wigs until everything is known (like I said, anyone can make a mistake). If they email or call back apologizing or acknowledging, I'm pretty much done. If I don't hear anything back I'd be much more inclined to cya myself including calling out their mistake. I won't take the blame if it's not me, that's fair.
Pretty much I think far more is accomplished approaching someone one on one with a chance for them to save face, acknowledge and take action to correct it, rather than calling them out -however correctly -in the middle of a meeting full of suits. I hope someone else would treat me in the same way!