This episode started with Ryan at his radio show talking about American Idol. Also at the very end of the opening credits the American Idol symbol turns black and white.
Avril Lavigne was the Guest Judge on Day 1 and Katy Perry was the Guest Judge on Day 2. This is the first time they have had two different guest judges for one city.
23 people made it on to the Hollywood Round.
When Ryan says "over the next hour" one of the contestants they show entering the room is not from day 1. You can tell because Katy Perry is there not Avril Lavigne.