This episode's glyphs spell:
The Observer can be seen behind a parked silver car as the NYPD car turns into a parking garage.
The patient record for 'CARSON, D' in 'Earthling' foreshadows Dr. Carson's involvement in the cloning experiments in 'Of Human Action'.
The simulated aircraft in 'Of Human Action' has markings on it that say "AUG B/12" and "RESCUE", foreshadowing August saving Christine Hollis from a plane crash in 'August'.
This refers to Walter losing his Peter in "Peter".