mistakeIt was just a silly mistake - no need to apologize.
errorHe admitted that he'd made an error.
blunderThe company was struggling after a series of financial blunders.
slipIt was an understandable slip.
mix-upThere was a mix-up with the bags at the airport.
gaffeI made a real gaffe by calling her "Emma", which is the name of his previous girlfriend.
slip of the tongueIt was a slip of the tongue - I meant to say "painless" not "painful".
misprintThe newspaper article was full of misprints.
typoRead over your CV carefully to make sure there are no typos.