Tommy Elliot gets his trademark comic book appearance in this episode. Complete with the bandages covering his entire face and trenchcoat. Unlike the comic Hush, however, Tommy actually needs them for medical reasons, as his head has been completely skinned.
Tommy mentions the journal contains plans for a "failsafe" in case the Batsuit falls into the wrong hands, something that Down Down Down (2019) established was a railgun. While Alice is also aware of the effectiveness of railguns against the suit, she isn't aware that Bruce made one as the aforementioned failsafe, and thus doesn't pick up on what Tommy's referring to.
Kate's codename during the nightclub operation is Red One, which is the same one she used in Batwoman (Rebirth) on her global mission with Julia. Julia's codename, Tuxedo One, is also from that comic but has been used in the show prior to this.
Batwoman fighting a Magpie on a rooftop for possession of a book is reminiscent of the DC comic Crime Bible: Five Lessons of Blood #3, where Batwoman and The Question battled for the titular Crime Bible.