[_____V_____]

***SPOILER ALERT***

Trejo's death was added later (it isnt there in the workprint). Maybe when Zombie decided the final version needed a bit more gore and Michael was to look scary (and do a bit more justice to the original), he added it. In the workprint we can see him actually control Michael...

And another part which didnt make sense. If young Michael loved his baby sister even a wee bit so as to spare her life...why grow up and go after her? In the workprint its shown that he merely wanted to meet her, and wouldnt have stalked and attacked her unless provoked first. In the final version, he has murderous intent because he is evil (according to Loomis in the briefing of his book), and then proceeds to Haddonfield to kill her?

What happened in-between...he "outgrew" his love for Laurie? Huge plothole, indeed.