FEW? I think there are so many usts with errors. Actually, most of the usts I downloaded have at least some minor errors in them. And the usts I make also have many errors(usually errors in lyrics are the most annoying).
But no intentions to offend the creaters of those usts. Some of them sound good or even better that way, and I think it is the ones who use the downloaded usts to correct the errors(though many people don't even bother to do so).
The most recent one I noticed was Hello, how are you(I don't keep track of the creaters unless I post them). And let aside the pitches, there were many lyrics errors that I noticed. Most of them confused the "h" sounds with "n" sounds.
And another, quite minor one that runs in my mind is Tokyo teddy bear(do not remember the name of creator either). Its harmony track has a so as a so# and that doesn't sound nice with the main melody and the karaoke. It has some other tones with the original song, but they are all negligible.
Well, I think I can write at least a dozen more, but I don't think it's that important to point out the mistakes;; Again, it is the ones who use the usts to double check all the features of them.