First appearance of Kes's longer hair style instead of the very short hair style from seasons 1, 2, and part of 3. Jennifer Lien, the actress who played Kes, was apparently sensitive to the make-up and adhesive used to apply her Ocampa ears. With the longer hairstyle, it was no longer necessary to apply the Ocampa ears each time she was filmed.
At Kes' birthday party, Neelix mentions her single lung. She donated the other one to save his life in Phage (1995).
This episode introduces the Krenim, who eventually reappeared in Year of Hell (1997) & Year of Hell, Part II (1997).
Second large piece of foreshadowing for Tom and B'Elanna's romantic relationship.
This episode is the only Star Trek: Voyager installment to show what an Ocampa baby looks like. It lacks the typical Ocampa ears, due to restrictions in make-up that can be applied to a newborn. It is also the last episode to feature other Ocampas besides Kes.