I would argue that 80-90% of those marked as tile errors aren't (ie. the ones that join on the inside corners) as if you compare it to how most people do their joins there, it actually ends a lot nicer. I'd upload a shot to show it but my mouse has gone missing and tiling with a laptop touchpad blows, so I'll try to explain in words...
Basically if you continue the bottom tile along into the inside corner join it ends in a vertical straight line, whereas the way I do it makes it more rounded and while it doesn't look perfect I feel it looks a lot smoother and more natural than merely continuing with that one tile. Again, it's not an error as it fits as well as the alternative but is a matter of tiling taste.
Cheers for the comment and errors though, some of those I'll admit are oversights
I'll try and find my mouse and get the darn thing finished and then you'll all see, muahahaha!
