The whole The Wizard of Oz thing is something that a person on hallucinogenics might see while under their influence. (Not that I would know.)
Interesting. I've never seen that movie, but I think that sort of thing was a fad in late 19th-early 20th century.
Alice in Wonderland definitely has a strongly hallucinogenic feel to it, and even Chesterton's fictional writings (much as I love them) have a strongly irrational atmosphere, such as
The Napoleon of Notting Hill, the
Ball and the Cross,
The Man Who Was Thursday, and most of the Father Brown stories.