Continuity mistake: When Michael Myers busts into the bathroom stall occupied by the truck driver, the glass on the framed advertisements on the opposite side of the stall is broken and we hear glass hitting the floor. When Myers leaves the stall, the glass in the frame is still intact.





Answer: He was hoping that Laurie would realise that she's really his sister. However, because Laurie was just a baby and raised by another family, she had no idea why Michael was showing her the picture or what it had to do with her.