There's speculation that Heath outright inked Kurtzman's layouts. If so, it was a good choice, and one of the few published Kurtzman stories where Kurtzman didn't ink himself. I wonder if Heath would have done more for MAD if he'd delivered something closer to his own style, since this story came along shortly after John Severin left an opening for a "realistic" artist in the rotation. (Not that Plastic Sam was that kind of story, but the Fifties were a crazy time, daddio.) Kurtzman later used him on Little Annie Fanny, so it's not like he held a grudge.
And Sam's face in that last panel!
Interesting interview with Heath here:
http://www.tcj.com/an-unpublished-conve ... uss-heath/ About MAD, he says, "Oh my god. I missed out. Didn’t do that right."