Kelso tells that when he was at first grade, he used to wear red cape like Superman.
When Eric is climbing after Kelso up on the garage roof, his looking down is a reference to the film.
When Kitty dreams that she is being attacked and trying to call for help while taking refuge in a phone booth, the phone booth scene is referenced when the glass starts to crack from birds flying into it while she screams.
Fez is wearing a Batman suit for Halloween.
One of the kids playing Trick or Treat wears a Spiderman costume.
The gang goes to the movies to see The Texas Chain Saw Massacre (1974).
One of the kids playing Trick or Treat wears a Stormtrooper costume
Red tells the gang about the hunting accident where his pal Frank got killed. Frank is seen in the episode Halloween.