Does Marvel ever find themselves correcting typos/grammar when they collect single issues into trades? Aside from the calendar that went out to comic shops last year I can't recall Marvel having a problem like that in a long time (though I don't read ever book so I could be wrong, but it's definitely better than what I've seen from IDW and Image). What is more important: presenting the original experience in the trade, or correcting typos and grammar?
On newer material, we’ll correct mistakes if they come to light before we do the collection. Those are mistakes.
On older works, it’s a judgment call. I don’t, for example, want my reprintings of AMAZING SPIDER-MAN #3 to correct the panel where Doctor octopus refers to Spider-man as Superman. That’s a mistake as well, but it’s a historic mistake, and so I want to experience that story as it was.