Whilst not exclusive, Negan's claim that "to be the man, you gotta beat the man" echoes a catchphrase of the professional wrestler "Nature Boy" Ric Flair.
PPE stands for Personal Protection Equipment.
This episode is called 'worth' and the the final episode 'Wrath'. The final episode of season 2 of 'Fear the walking dead', the spin-off, was called 'North' and the one before 'Wrath'.
Negan (played by Jeffrey Dean Morgan) names Simon a ghoul. JDM was recurring guest star in "Supernatural" as protagonists' father who was hunting supernatural things, including ghouls.