When George is talking to Mellie's family, he mentions her coming into the OR. Mellie never went to the OR- he should have said the ER.
When Finn is talking to Meredith about being scary and damaged, he says that she "likes dogs and you enjoy pony births." In the previous episode, Meredith had gone with Finn to help a pregnant horse give birth. A baby horse is a foal, not a pony, and a real vet would never confuse the two.