One person's "error" is another person's spark of inspiration. It's is a bit like the English language like wot she is spoke on Mudcat. You can be deliberately colourful in an "erroneous" way or you can be ignorantly inelegant. Same with music. The trick for a musician worth his or her salt is to be able to tell the difference. There are uninspired chords, imaginative chords (some of which may grate for some people) and there are downright wrong chords. Sometimes, any chords at all are the wrong chords. There is subtle and sublime variation springing from the long experience of an accomplished player, there are misheard notes that don't matter much and there are downright bum notes. Then there are clever clogs who are serving themselves instead of the music. Taste blurs all these categories round the edges a bit.