<<I DID bite my tongue a little on the commentary, though, because I figured Bradbury would get roped in to participate in the bonus material, and therefore my commentary on that same DVD wasn't the place for me to make a few of the comments I wanted to make.>>

You needn't have held your tongue.  It wouldn't have been difficult to address the issue in a diplomatic way, i.e., "Bradbury says the development of the script occurred this way... Alland says it occurred this way, etc."  By placing both statements side by side, I'm sure the viewer would have come to the same conclusions you yourself have reached.  As the years wore on, it seems as if both Harry Essex and Ray Bradbury "misremembered" events so as to transform themselves into the Hero of the Tale.  This phenomenon isn't uncommon, in or out of the entertainment industry.

BTW, I saw IT CAME FROM OUTER SPACE at The Egyptian Theatre in Hollywood during their memorable, month-long 3-D Film Festival back in 2003.  Bradbury made a personal appearance before the screening.  He told the audience the story about Harry Essex exactly as he's always told it ("Ray, you know you're a jerk?"), then proceeded to reveal that this was the very first time he would be seeing the film since its original premier back in 1953.  His opinion of the film must not have improved over the years--I was sitting only a few rows back from Bradbury, and watched him leave the theatre during the intermission! 

That's a shame, as I've always considered ICFOS to be the best film with which Bradbury was ever involved.  (Perhaps Huston's version of MOBY DICK has rabid devotees, but if so I've never met them.)