If you look closely when Nick accesses case files in the computer, you will notice that the Sylvia Mullins file was created on Jan 19 2006---the same date as the episode premiered.

When Nick clicks into the file concerning his kidnapping, the file creation date is May 19 2005---the same date as "Grave Danger" (the episode concerning that particular case) premiered.

Next to this is a file modification date: Sept 23 2005. This is one day off from Sept 22 2005---the date "Bodies in Motion (where the Walter Gordon tape is analyzed) premiered.

Warrick: Two hot chicks and he was out here working on his bike. Doesn't make sense.
Grissom: Maybe he wasn't invited.

Warrick: Who brings a gun to a knife fight?
Grissom: The winner?

Brass: You know, let's fill in the blank: if it walks like a stalker, talks like a stalker..
Tom Harper: I'm not a stalker!
Brass: Then what's this? Excellent service?

Title: Daddy's Little Girl

Daddy's Little Girl is a song often played at weddings while a bride dances with her father. The term has also developed some unfortunate contrarian connections to the notion of child abuse by the father.

Grissom: David, check and make sure that they didn't pull a Lorena Bobbitt.

Lorena Bobbitt is a woman known for cutting her abusive husband's penis off with a knife.