I think "f up" really nails it. I remember my combo director in college telling us that if we f'd up during the upcoming recital, he'd play it on repeat. Not even the whole song, he'd fast forward to the f up and only play that. It was a pretty impassioned speech from a very chill-but-intense dude that clearly left a mark on me as a young bass player. Learned a lot from that absolute monster of a musician, including admonishments to - if against all reason we did manage to f up - to at least not make the "f up face." Dude has a Grammy now and I've never met someone who deserves one more.
Edited because I forgot that there was no swearing, and this post contained a lot of it. My bad.