I guess I will take a shot at Clue 3.
The image is of Dinah Hayley, which we already knew from posts past. While I do not know what 'M' means, the guesses of mascot or marketing may not fit my guess, but here it is anyway.
The Shortcut was EXTENDED. Really the only information you can find on Dinah relates to her mother Mary Hayley, or her uncle John Wilkes. Considering the clue is EXTENDED, I will take that to mean extended family, of which that points me at John Wilkes. John Wilkes was born on October 17th (same as me, actually, not that I think that factored in here).
Horror movie released on October 17th: The Texas Chainsaw Massacre. This, however, is not my guess.
I am going with the death date, which is December 26th, which Wilkes was 72 at the time of his death. A movie that was shot in 1972 and released December 26th (1973) was The Exorcist.