Promoted Fanboy: Prismarina started out as a prominent YouTube theorist in the Empires SMP Season 2 fandom, and is given the opportunity to collaborate with three of the series' content creators in the WitchCraft SMP.
What Could Have Been: Scott the content creator has planned out two alternative endings for his character in case he didn't win the Witch Trials.
If Cleo had won, she would have transported character-Scott back in time to the day Milo drowned, and he would have backed out on the picnic by the lake that led to everything snowballing from there. This would have saved Milo's life.
Word of Gay: Shelby has confirmed that all characters she has played are asexual (like she is in real life), including the Storm Witch. Since the Storm Witch is the same character as her Season 2 character, she's more specifically biromantic and demisexual.
Joey, Scott, and Shelby are all members of the Empires SMP and the Afterlife SMP; this is significant for Shelby's character in the series due to Character Overlap with her Empires Season 2 counterpart, while Joey's character is inconsistently a reincarnation of Pirate Joe and possibly Shulk.MythicalSausage, TheOrionSound (Oli), and LDShadowLady (Lizzie) from both series also make cameo appearances in the WCSMP. Additionally, El voices Sausage's dog Bubbles in the latter's Empires Season 2 finale.
Cleo is on Hermitcraft and also briefly appears in Empires Season 2 via the crossover between the series; in turn, Scott, Shelby, Sausage, and Oli briefly joined Hermitcraft as crossover guests.
Both Scott and Cleo have played on the Life SMP, with the filming schedule for WCSMP and Limited Life (Season 4 of the Life series) overlapping near the former's end; to Cleo in particular, the Life series is canon to the WCSMP as an alternate timeline.
El, Scott, and Shelby were all part of the Rats SMP, alongside Lizzie, Oli, and OwengeJuice (who make cameos in the series).