I think the most amazing mistake Spotify made was that recently all private playlists suddenly became public, because they changed the meaning of private and public to introduce some weird third level of privacy. I now have no idea what the privacy settings do.

Second most amazing was when they made the scrollbar literally two pixels wide and therefore unusable.

It’s not even that these are huge errors but it just makes you wonder who drove those change and why? What on Earth are their teams up to when they’re prioritising those kinds of changes?