Halloween (1978, John Carpenter)
Two points of interest: 1.) Very spoiler heavy 2.) With one or two exceptions, pretty much cut in sequential order
Halloween II (1981, Rick Rosenthal)
You can tell the difference in the movement of Michael Myers in this film, after the original actor, Nick Castle, was not rehired. There's a grace and rhythm to his performance that's lacking in all the other sequels, especially lame is the little pirouetted jump in the early attack scene shown here. Curiously, Jamie Lee Curtis is relegated to a minor selling point in this trailer, not appearing until the final thirty seconds. Also, no hints at the eventual lame reveal of her character's relationship to Myers' twist.
Halloween III: Season of the Witch (1982, Tommy Lee Wallace)
I like that this trailer doesn't feel compelled to explain why part III doesn't pick up where the first two Halloween films left off, although ruining Cochran's scheme in the first seconds of the trailer is unforgivable.