The Wizard of Oz

The Wizard of Oz is a classic 1939 film that has been referenced in Gargoyles several times.

The Hound of Ulster

Elisa paraphrases a line from the film when she says "I don't think we're in Scotland or Kansas either." Later, the Banshee tells Cu Chullain that she'll get him and his little dog too.

The Gathering Part One

After arriving back in Manhattan, Elisa declares to Goliath that there's no place like home.

Masque & Bash

Angela and Broadway dress up as Dorothy and the Cowardly Lion, respectively, for Halloween.

Tidbits

The Wizard of Oz is also referenced in the non-canonical Gargoyles/The Spectacular Spider-Man crossover Religious Studies 101: A Handful of Thorns. [1]

Early in the development of Gargoyles, there was going to be a villain called "The Sorceror/Sidero" who was described as manifesting himself in a Wizard of Oz state as a big floating head. [2][3][4]

Greg Weisman is a fan of the film [5] and has implied the Banshee is too.[6]