Both Nathan Fillion and Seth Green co-starred on Buffy the Vampire Slayer (1997), several seasons apart though.
Both Nathan Fillion and Seth Green have worked on the "Guardians of the Galaxy" franchise for Marvel. Fillion played the voice of a Monstrous Inmate in Guardians of the Galaxy (2014) while Green was the voice of Howard the Duck in both Guardians of the Galaxy Vol. 2 (2017) and the animated series Guardians of the Galaxy (2015)
Steve Monroe, the victim of the vandalism, and Zanye Emory, who plays Henry Nolan, played father and son on Crazy Ex-Girlfriend (2015).