While Grace is in the waiting room about to meet Nathan Berry, he calls out for designer Antonia Hutt. There is a real interior designer called Antonia Hutt and she is married to episode writer Jhoni Marchinko.
Will remarks to Nathan that he seems to be like a villain who should be "twirling a mustache and tying Lillian Gish to the train tracks". While tying damsels in distress was a popular trope in silent movies, Gish herself never appeared in such a scenario.
When Will jokes to Nathan that he's already picked out the names of the cats they will have, he calls them Grizabella and Skimbleshanks. These names are from the musical "Cats".