Torrey Devito and Matt Barr both played psychopaths on One Tree Hill. Torrey played the crazy nanny Carrie while Matt played stalker Derek/Ian.
The murder weapon of the episode was an obelisk-shaped statue. Rick Castle identifies it as being shaped after the Washington Monument, a 169 meters high obelisk in Washington, D.C.
In the episode s2 e3. Kate and Richard talk abouth The Talented Mr. Ripley and, in the previous episode S2 e2 they talk about Strangers On A Train, both a books by Patricia Highsmith.