Board Thread:Episode Discussion/@comment-4141313-20181110034633/@comment-37479484-20181111185938

Welp, now to wait another couple volumes before the reference gets explained. But still, it's an awesome little Easter egg that nobody would have linked to Salem before this episode.

Not to mention other stories mentioned in universe like The Thief and the Butcher (Merc and Emerald reference) and the Violet's Garden (Still no clue). To be honest I only found the reference by looking at old Reddit threads on the two brothers because those guys are basically assholes.