20 Things You Didn't Know About Halloween (1978)
11. The Real Smith's Grove Sanitarium
At the outset of the film, Smith's Grove Sanitarium is established as being quite a gothic and unsettling institution when the audience sees Dr. Loomis and Marion Chambers (Nancy Stephens) driving up to it. This is mainly because the scene is set on a stormy night with all of the patients wandering about of their own free will.
However, when it is formally introduced only a few scenes later, Smith's Grove appears to be just the opposite, as it is clearly quite a modern facility.
As Loomis and his colleague, Dr. Terence Wynn (Robert Phalen) exit the building, discussing the escape of Michael Myers, they cross a doormat which reveals the name of the actual institution that was used to represent Smith's Grove: La ViƱa Hospital and Sanitarium in Altadena, California.