Every so often, shortly after I've distributed a hastily prepared handout of some sort, a hand will go up. I quickly apologize, thank the sharp-eyed student, ask everyone to make the appropriate fix, and move on. Unless I feel like having a little fun, in which case I might begin a little riff about how students should always study things carefully and be prepared to respectfully challenge what they read or hear. Everyone makes mistakes.
Teachers make mistakes.
I make mistakes. That last line will invariably elicit a knowing grin from those few students who understand I'm being facetious, and blank stares from those who either don't get it or have momentarily tuned me out. But the point remains. Teachers make mistaks. And I'm not talking about just proofreading more carefully before heading to the copy machine in the faculty room.