A flyer outside the nightclub in 'Letters of Transit' says "Experience the Epicenter Club", foreshadowing the earthquakes caused by Cortexiphan subjects in 'Worlds Apart'.
A sign for "Liberty Wind Chimes" in 'Worlds Apart' contains the Liberty Bell in its logo, hinting at the return of William Bell in 'Brave New World' (Part 1)'.
FRINGE DIVISION CASE FILE #420-42712
FRINGE EVENT: Synchronized universe earthquakes
CLASSIFIED CASE CONNECTION(S): David Robert Jones/Cortexiphan subject activation
AGENTS ASSIGNED: Dunham (OH), Lee (OH), Dunham (OT)
SUPERVISING AGENT: Secretary Bishop, Agent Broyles
FILE ARCHIVED BY: Daniel Senkerik, Robert Schatz
WITNESSES/CONTACTS: Nick Lane
LOCATION: Manhattan, NY
VICTIM(S): Agent Tim [redacted]
CASE REPORT SUMMARY:Emergency Services received multiple reports of twenty-seven earthquakes all over both universes. Most occurred nowhere near major fault lines and registered between 5.7 and 7.1 on the Richter scale, and they all started at exactly the same time—11:00 a.m. GMT.