it doesn't matter whether he can give examples or not.
all that matters is whether or not they are different in this particular aspect of the plot(does murasaki get saved+become fiance or not?). somehow, i doubt it changes between anime/novel/manga, and thus his correction serves no purpose. he might have even misunderstood you.
anyways, i think im gonna wait until next week's episode before watching this week's. i'd rather not leave off with shinkurou being a faggot; chances are things will be looking up by the end of next episode.