Errors are countable, so fewer errors.

The perils of editing! I have discovered that every time I come across a less/fewer error my toenails curl up a little more. Thankfully there are fewer of those landing on MuddyUm.

Anyway, paragraphs that start with "Anyway,"? (of which you are innocent here, thank you) Every time a run across one of those I die a little inside, so I guess I am not long for this world. When they take my shoes off they'll be like, "What?"