You're going to have to be specific in your requests. If it's minor, it'll be difficult to see on a computer screen unless you're posting high res scans and directing our attention to the area in question. At a glance the note looks normal.
I just took out a $20 but i dont see anything different on yours maybe you could be more Specific on what you think is different.
I'll bet the OP is asking about ink offset from the front of another note on the back of his note, which will likely appear to the OP as ink bleed through... HOW MANY times does this question get asked! It's not an error, but rather a quite common issue resulting from stacking sheets of freshly printed notes not yet thoroughly dried, some pressure on the stacked sheets may accelerate this transfer of ink from one note to the next.
Yeah, not very good pics for us to go by, but it's easiest for me to see on the second pic in the OP.