In case fans forgot, Pretty Little Liars: Summer School was more than happy to remind Us that the show exists in the same universe as Riverdale.
Riverdale fans realized that Greg's cousin has to be Kevin Keller, who was played by Casey Cott in all seven seasons of the iconic CW show. Max's Pretty Little Liars previously hinted at a connection to Riverdale when the core friend group went to the Sisters of Quiet Mercy. The home — run by nuns — for troubled youths was originally introduced on Riverdale.
'That was the biggest conversation we had after season 1. Were we going to keep the theme of the Original Sin? One of the reasons we decided to try a different theme and a different subtitle is because we felt like would we ever beat the original sin from season 1?' he explained in May. 'We thought, 'Would it ever be as personal and as primal as ?' So maybe it's OK to move off of that idea.