This was the last new animated Ghostbusters story until Extreme Ghostbusters (1997), and is the last to feature the original Ghostbusters exclusively.
Apshai received an entry in the 2016 tie-in book "Tobin's Spirit Guide - Official Ghostbusters Edition" on page 74, where it is identified as a Class VI Insect Demon.
Janine ends up wearing three different sets of clothes, two of which were seemingly brought by her colleagues in Ecto-1. She dons her jumpsuit for the first time since Jailbusters (1989).
Peter has a premonition of giant red preying mantis attacking him. This is the second time Peter has had a precognitive dream about the entity encountered later in the story. The first time was of the Sandman in Mr. Sandman, Dream Me a Dream (1986).