Morgan often calls Reid "Pretty Boy." Off-camera, Shemar Moore calls Matthew Gray Gubler "Pretty Ricky" and Gubler calls Moore "Baby Boy" in reference to Morgan's nickname for Garcia "Baby Girl."
This is the first appearance of Reid's mother.
The music played by the music box is Forellenquintett by Franz Schubert. This is German for "Trout Quintet" which is what Gideon calls it when it's played.
First appearance of Jane Lynch as Spencer's mother, Dr Diana Reid.
At around 14:56-14:58, a joke/affirmation card is visible on the lower right side of Penelope's Computer monitor. The card is made out "To Kirsten" which is the actress that plays Penelope Garcia on the show.