This is the first episode since The Death of Vibe (2018) to feature all ten of this season's series regulars.
Danielle Panabaker is absent for the majority of the episode, only appearing at the end, as she was busy directing episode 18, "Godspeed (2019)".
Cisco says "Cue up Operation: Shazam," before proceeding to scratch into the Time Sphere what looks to be a lightning bolt, a reference to the hero of the same name, implying that he exists in the same universe.
"It's so funny, they all think Game of Thrones (2011) ends in 2019," Nora's journal reads but her journal entry could be referring to the spin-off series of the franchise that is set to enter production early summer of 2019.
When Ralph says he Peter'd Parker Kamilla, he does the famous Spider-Man "twip" swinging motion, he also says "I mean, Kamilla is a great photographer, and I thought she could start taking some pictures for Iris, and then maybe she'd start to come around STAR Labs," he explained. "I don't know, if we're lucky, get bitten by something radioactive, become like a Spider-Person."