Jorja Fox (Sara Sidle) wrote the goodbye letter to Grissom herself.
This episode features the contemporary 2007 design and version of the real website version of Twitter. (Previously the series has used fictionalised and/or outright fake websites).
This was Holland Roden's first television role where she guest stars in this episode as a murdered victim. She would later be known as Lydia Martin in the hit MTV show Teen Wolf.
Sara's investigation calls back to an earlier case.