In keeping with the "8" theme, the signal Spencer sends is given the encryption code H8-88. "H" is also the 8th letter of the alphabet.
The number 8 appears to be significant in this episode: In the final showdown, the mirror in which the unsub sees himself is an octagon (8-sided), the chandelier behind Rossi has 8 arms, all the windows in the house have 8 panes of glass, and the couch has 4 seats making 8 cushions on it.
Prentiss: Poker chips are things.
Rossi: George Augustus Sala said, "A gambler with a system must be, to a greater or lesser extent, insane."
Hotchner: A Chinese proverb says, "At the gambling table, there are no fathers and sons."
The song "Day In, Day Out" heard during the opening credits was performed by Robert Davi.
Although set in Atlantic City, this episode was filmed at Agua Caliente Casino Resort Spa in Rancho Mirage, California.