When Arizona returns home to find Callie has left her, she bends over to pick up Sofia's sip cup. When she does this, you can clearly see two human feet despite the fact that Arizona received a leg amputation a season earlier and has a prosthetic left leg.
Jo showed notable facials injuries after her confrontation with her boyfriend, which took place the night before the storm. In this episode, shortly after the fight, she appears almost totally healed.
Derek tells Meredith that Heather Brooke's mother is coming "down" from somewhere in Oregon.