1.In Hocus Pocus, you can see a horror icon on the back of Max's skateboard.
2.In Casper, you can see Dan Aykroyd leave the ghost-infested house in a Ghostbusters outfit (he starred in the movie).
3.In Halloween, if you look closely at the poster, there's a screaming face hidden in the killer's hand.
4.In Hotel Transylvania, the airplanes resemble those from Romanian airlines.
5.In The Nightmare Before Christmas, the Cyclops appears to vanish during the "Making Christmas" song.
6.In Coraline, the egg yolk that Other Mother is cracking looks like Jack Skellington.
7.Also in Coraline, we can see this old photo of Coraline and her parents, which shows her with brown hair, meaning that she dyes her hair blue.
8.In Monster House, Constance Nebbercracker — whose spirit haunts the aforementioned house — is first introduced as the circus attraction dubbed "the Lady As Big as a House."
9.Also in Monster House, the basketball that Chowder gets stuck in the hoop at the end of the film resembles a jack-o'-lantern.
10.In Corpse Bride, the jazz bar is called "Ball and Socket," a hip joint — which, coincidentally, also describes the vibe of the jazz bar.
11.In Beetlejuice, Delia is wearing Charles' sweater as pants while she cooks.
12.Also in Beetlejuice, Otho jokes that those who kill themselves become civil servants in the afterlife. The information lady in the waiting room all but confirms this.
13.In It's the Great Pumpkin, Charlie Brown, Lucy can be seen reading a copy of TV Guide with a picture of herself on the cover.
14.In Scream, while watching Halloween, Randy — played by Jamie Kennedy — screams, "Behind you, Jamie!" He is, of course, referring to Jamie Lee Curtis but is obviously unaware that Ghostface is behind him.
15.Also in Scream, the janitor — named Fred — is dressed like Freddy Krueger.
16.In Trick 'r Treat, the candy bar that Sam takes from the principal is revealed to be the one with the razor blade in it.
17.In Carrie, Carrie had a crush on Tommy, the star quarterback. In the closet Carrie's mother locks her in, she doesn't pray to Jesus but, rather, to St. Sebastian, the patron saint of athletes.
18.In Addams Family Values, you can briefly see Pugsley in the background pretending to hang himself when he and Wednesday arrive at Camp Chippewa.