The death of both these groups in one episode is reminiscent of The Walking Dead season 8, episode 10, when Negan's right-hand man, Simon, kills all the Scavengers except for Jadis.

In the season 8 episode “How It’s Gotta Be,” Carl revealed to Rick and Michonne that he was bitten by a walker episodes earlier (in “The King, the Widow, and Rick”) while saving Siddiq.