In the first season, AI had finally sifted down to the TOP TEN when it was discovered that one contestant (can't remember the name) had lied about his age. The limit back then was 24 or 25 and this guy was 29. So they booted him and brought back semi-finalist E.J. Day. He could barely sing, though, and was voted off the first night of the finals.
In season 2 (and maybe 3), the judges had a "second chance" group perform again in the semi-finals. This group consisted of people that the judges thought deserved another shot. Clay Aiken was in this group. He won and went on to the Top Twelve.
And this season, Nikko Smith was brought back to replace Mario Vazquez.
I don't recall anyone being brought back last year.
I still miss Nikko. I know he wasn't a favorite but I liked the Rhythm and Blues style he had.
I had forgotten about EJ! That was so wrong. Maybe that is the reason they increased the age limit.
Now if BO gets booted off I'll be so disappointed!