This episode marks the return of Amanda Righetti ("Grace Van Pelt") who hasn't been seen since "Red in Tooth and Claw" (her absence was explained by her attending a computer hacking course in Los Angeles). Righetti had given birth to her first child January 10, 2013.
Red-haired actresses: Julie Claire, Donna Murphy, Maggie Egan, Alexis Cara.
The victim at 00:53 can be seen clearly on the roof of the car in the exact same pose as Evelyn McHale who famously committed suicide by jumping from the Empire State Building and being immortalized via photo as "The Most Beautiful Suicide" according to Life magazine.
When Van Pelt is showing the list of attendees, you can see the Meghan Fox (the actress) and also the name "Leo Ibanez" in the list; a clear indicator to (Leo) Fender and Ibanez, two of the biggest guitar manufacturers in the world.