I thought when he said, "He didn't know it was going to be a hit" he was talking about the original movie...and was upset that he was passed over for the leading role in the sequel.

I assumed that was an outtake.
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Why didn't the guards on the property take note that the drapes were open? - they had probably been open for some time.

Maybe Kay opened the drapes? What if during the interval between the culprit opening the drapes and the attempt, Kay had gotten out of bed and closed the drapes?

I bet it was somebody from the 6th family who opened the drapes.

Who opened the drapes in Sony's car on the turnpike?

I know I'm rushing home and hanging some drapes.

Guns don't kill people, opening drapes kills people