17 Seconds - S2-E26
Visible crew/equipment: After Burke and Alex board the helicopter to get the heart transplant, in the shot of Cristina backing away from it, you can see a red-capped crewmember and the camera reflected in the chopper's window. (00:06:25)
17 Seconds - S2-E26
Revealing mistake: When Burke and Alex find out that the heart donor patient is dead, and rush to revive him, in one shot of the donor's face you clearly see him blinking his eyelids. (00:13:35)