Out of tune, out of sync and sloppy on some parts, but I wouldn't say a lot of mistakes. In fact, the first time I heard 6DOIT was on that DVD and I barely noticed anything, it wasn't until I familiarized better with the songs and re-heard on the CD that I started to notice the mistakes. I'm not a proper musician though, just a below-average guitar player with one year of music theory, so maybe to better trained ears it sounds worse.