No one wants to admit weakness in an interview. And you know what? You don't have to! You can explain a situation where you did something wrong or incorrectly. Try to stay detached from it by explaining in a calm manner, "I accidentally pushed "send" on an email before proofing it." Now, what did you do once you realized you did something wrong? "I knew there were typos and I may have phrased something in a way that could be confusing. I called my manager and explained to make sure they didn't take the message the wrong way." Show you took initiative in handling it. If the consequences were greater than frustrating your boss or having to apologize, show you handled it by being humble and calm. Next talk about what you learned from it and the actions you will take to make sure it never happens again.