Jason London (Dr. Ryan Heller) is the twin brother of Jeremy London, who starred on the show "Party of Five" with Jennifer Love Hewitt.
Christian Campbell is the older brother of Neve Campbell, who co-starred with Jennifer Love Hewitt on "Party of Five".
In this episode, about 14 mins & 54 seconds in, when Haylie is walking her dog & talking to Eli, they walk past a specific house. This house was Toby's house from, "Pretty Little Liars!"