der Fehler — the error, the mistake.
der Patzer — a slip, a blunder.
der Schnitzer — a gaffe.
der Lapsus — a slip, from Latin.
der Druckfehlerteufel — the misprint devil, blamed in jest for typing errors.
einen Bock schießen — to shoot a billy goat. To make a mistake. Duden traces it to the shooting guilds, which gave the worst marksman a billy goat as a consolation prize.
Mein Fehler. — My mistake.
Da muss ich Sie korrigieren. — I have to correct you there.