The opening scene of the episode repeats last episode's ending scene, but at the end of next episode, Meredith and Penny stared at each longer in silence while they recognized each other, whereas in this episode Meredith almost immediately asks them to come in. Last episode, the pause was long enough for Callie to show and say that she brought wine, but in this episode, Callie doesn't mention or show the wine as she's almost immediately entering the house.
The flashback to How to Save a Life has Penny's closed-captioned dialogue showing as "We're not a trauma center or a teaching hospital", but the dialogue can be heard is "We're not a trauma center. We're a teaching hospital". Additionally as a resident working at Dillard proves that the hospital was a teaching hospital, prior to its closure.
April Kepner mentions that she made a mistake as a second-year resident that killed a patient. However, Kepner was a third-year resident at the time.
Meredith states she moved back into her house about a year and a half ago, while it's in fact only been half a year. She didn't move back until after she returned to Seattle.