I really like that #10 bill. I'm no expert and I am not sure that being a bit off-center is considered an error. Same with the number that is out of alignment. But those two oddities along with the star make it an interesting note.
I'd keep the $20 bill too -- but I am keeping all the star notes that I find. I know I'm hanging onto stuff that probably has no premium but I like them and I just collect for fun.
If you're looking to sell them, you'll need to wait for an expert. I'll check back to see what they have to say.
It wasn't that long ago when I thought that 'mint error' meant that something was wrong with my candy.