When turtles are born, they absorb the minerals around them and the chemicals from that exact area. This enables them to lay their eggs in the same spot.
Sabrina's Doppelganger corners Theo, stating that she can turn him into a real boy. The idea that, because Theo transitioned into a boy does not make him a real boy. Her transphobia upsets Theo as he states, he doesn't need to be born a boy to be a boy.
Dwight is confident that experience is the best teacher. He simulates a real fire for his co-workers to find out if they understand what to do in the event of a fire. During the simulation, he tries to give them advice, but they are too panicked to pay attention to him.