Tom Lenk was a regular on Buffy The Vampire Slayer which also used the "Murder House" as a location for shooting. It can be seen on S4 Ep4 "Fear Itself".
The characters Connie and Dylan are named after Connie Britton and Dylan McDermott, actors who played the two main characters in Season 1 "Murder House"
Adam Hagenbuch and John Brotherton were both regulars on Fuller House