The wrong note becomes larger when fear makes the next note hesitate.

A single mistake is small and passes quickly. What makes it grow is the flinch after it: the fractional pause, the loss of nerve, the way the following phrase arrives apologetically and tells everyone that something went wrong. Listeners rarely catch the note itself. They catch the reaction to it.

When you slip, in music or a talk or a conversation, keep the pace and carry on into the next thing. Correct it later if it needs correcting. Most errors are absorbed by whatever follows them, provided whatever follows them is steady.