Battle Axe Nurse: The ER nurse is a no-nonsense kind of woman. She completely dismisses Mulder after she learns he's not Scully's husband and bars him from her hospital room. It's implied by a later comment when she catches Doggett in her room that she's had to remove Mulder more than once is is thoroughly annoyed.
Dislikes the New Guy: Mulder really can't go two minutes in this episode without making derisive comments about Doggett or being snarky towards him. Scully tries to temper his ambivalence by telling him that Doggett is worth the effort.
Hand on Womb: Gender flipped example. After Scully's scare with a placental abruption, Mulder places his hand on her pregnant belly to feel the baby move. The look on his face is a priceless combination of wonder and awe.
Hospital Gurney Scene: Scully gets one, with Mulder running alongside providing info to the attending medical professionals.
Mother Nature, Father Science: Played straight in this episode by Doggett and Reyes, with Reyes whole-heartedly believing the supernatural elements of the case and Doggett not wanting to believe.
Occult Detective: Reyes jumps right into the X-Files kind of work with both feet, having sustained a supernatural event while working with Doggett years before regarding the kidnapping of his son. Her original line of work also includes consult to LEO's on satanism.