It seems for the most part they switched days. The auditions that they said were Day 1, were actually Day 2. You can tell because after the final contestant they wrapped up the show, and the clothes the judges were wearing were the ones that were from "Day 1".
The first contestant, David Leathers Jr., mentioned that he was in (and won) a competition with Season 10 Winner Scotty McCreery.
Colton Dixon becomes the first person ever to be given a golden ticket (or even an audition) without signing up to audition.
This is the first season where there is no Judging changes, since Season 7.
42 people made it on to the Hollywood Round