My daughter was told by a Curtis prof something to the effect of, “We can’t often agree on musical issues, such as how Bach should be played, so we look at what we can agree on: rhythm, intonation.” That said, slip-ups are not always held against students who seem talented and well-prepared. I’ve known many students to be admitted to schools like Curtis and Juilliard who had small slips or memory lapses in the audition.