457 KHz is the frequency used by Avalanche beacons.
"Dia de Muertos" is Spanish for "Day of the Dead" and it occurs a day after Halloween.
Jack donned the Hockey Mask used by Jason from Friday the 13th (1980) and the bladed glove used by the child killer Freddy Krueger from A Nightmare on Elm Street (1984). Jason faced off against Freddy in Freddy vs. Jason (2003).