Other mistake: There are two mistakes when Grey is at the computer trying to figure out why her patient is having seizures. The camera pans out showing Bailey walking up - if you look at the computer it shows a login screen, but when Grey shows Bailey the screen it changes. Next one is when Grey blows up the pic of the taratoma - when they leave the picture on the computer it's actually a brain.
Continuity mistake: Avery and Kepner are at the bar. Keep looking between them (over Kepner's left shoulder). Right when Kepner says "I'm a soldier" a guy in in the background comes around the corner wearing a dark shirt with what looks like a red vest/sweater. The camera changes to a different angle for Avery's line, and then when it comes back to Kepner for her next line, the guy in the red sweater/vest comes around the corner again. (00:16:00)