The song that Lily was listening to is by Demi Lovato & Joe Jonas. Demi Lovato was a recent guest star on the show.
Teddy Altman warns Jackson Avery that he's going to break his patient's ribs whilst he's doing CPR between the trapped doors. In fact, you're not pumping on the chest hard enough during CPR if you don't break a rib or two, especially for a Doctor who would be doing the technique correctly.
In many television episodes with documentary story lines, most of the episode consists of showing the crew walking around and filming, with little attention paid to the final product. In this episode, however, the camera crew is rarely shown and the whole episode is the final documentary on the show Seattle Medical- Road to recovery.
Every episode of the show is named after a famous song. "These Arms of Mine" is the title of a song written and performed by Otis Redding.