Up until The Blair Witch Project (1999), Halloween was the highest grossing independent movie ever made. It was made with a tiny budget of $310 000, but made $50 000 000, at the box office.
When Lindsay is watching TV alone, the movie she is watching is The Thing From Another World (1951). A few years later, John Carpenter, who directed Halloween, would film a remake entitled The Thing (1982).
Donald Pleasance's character is named Sam Loomis. If you've seen Alfred Hitchcock's Psycho (1960), this sounds very familiar because John Gavin, who played Janet Leigh's lover in the movie, was also named Sam Loomis.