The first, and only, appearance of Fez's host parents, the Erdmans.
The conspiracy theory that music played backwards (also known as back-masking) contained hidden messages was started in the 1970s. These messages were connected to some bands at the time, but the theory was never proven true.
The scene where Red and Kitty are sitting at the counter in Phillies looks almost exactly like the painting, 'Nighthawks', by Edward Hopper.
The scene of Kitty and Red at Phillie's Diner is a reference to Edward Hopper's iconic 1942 painting, "Nighthawks".