Nick no longer has a mustache.

We learn that Grissom's father was a botonist and that he died when Grissom was 9.

The woman that visited Nick was Kelly Gordon, the daughter of Walter Gordon, who buried Nick alive in episode 25 of season 5 entitled "Grave Danger".

Robert David Hall (Dr. Robbins) did not appear in this episode.

Sara: Jesse's been missing for four years. We're chasing a ghost.

Warrick: What's a 4-5-0?
Karen: That would be sex with a dead body.

Brass: King Solomon cut him in half.
Catherine: King Solomon didn't have a DNA lab.

Catherine: It's hard for anyone to let go of someone they loved.
Grissom: Yeah. After my dad died, my mom would still get him a present every Christmas. She'd put it under the tree. Christmas morning the wrapping paper would be all crumpled up. And uh.. the tie or the sweater or whatever it was would be hanging in the closet.
Catherine: How old were you when you he died?
Grissom: Nine.
Catherine: Little guy.
(Pause, then Catherine moves to go collect evidence)
Grissom: He taught botony. He uh... came home from school one hot and humid day laid down on the coach, I was watching TV. My mom brought in some cold drinks but she couldn't wake him up.(Pause) No one would tell me why.

Greg: It's like trying to get an ID on swimmers from ripples in the pool.

Title: Still Life

The term still life is an artistic term referring to a type of painting which is composed of inanimate, usually lifeless objects, such as fruit, coins, pipes, flowers, etc. It also evokes notions of a life stuck in place and unable to move forward, which is its reference here.