Both Sweets' comment that Ray Buxley is "Freddy creepy" and Booth's that he has a lot of blades are nods to Englund's role as Freddy Krueger.
Ray Buxley's job as a school janitor is a nod to Robert Englund's role as Freddy Krueger, a school janitor.
Robert Englund's line "They always give me the willies" is a reference to his character in the TV series "V."
The episode is called "The Death of the Queen Bee;" for much of the episode, Angela is wearing a black dress with a yellow sweater.
Being that this is 2010 and Bones was the class of 1994, this would be the class 16 year reunion. Most reunions are in 5 and 10 year intervals so this may have been scheduled to originally air in 2009.