When Naomi yanked at that woman's "arm" and the phony appendage broke free in her hand, how did Joan Bennett keep a straight face? I'll bet if Louis Edmonds had to do that scene, he would have bust a gut in performing it.
In an episode of the great series M*A*S*H, Alan Alda (Hawkeye Pierce) has a nightmare and somebody pulls off his phony arms during a dream sequence. The M*A*S*H scene is just as tacky and silly as Naomi's "bloody arm dream."
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The loose arm looks like the same one Jeff Clark had in the box that he delivers to the immortal Dr. Eric Lang. "Julia, when you do the experiment again."
Bob the Bartender, who thinks that the scene where the Frankenstein monster rips the wooden arm from actor Lionel Atwill's arm in "The Son of Frankenstein" was, in contrast, filmed very convincingly.