Visible crew/equipment: When Flash is attacked by the alien he falls on a noticeable brown safety mat.

Flash Gordon (1980)
1 visible crew/equipment mistake
Directed by: Mike Hodges
Starring: Max von Sydow, Sam J. Jones, Topol, Melody Anderson
Continuity mistake: The egg timer in the jail is about to run out, but when Dale runs over to it and tries to turn it over, there is more sand in it than before.
Prince Vultan: GORDON'S alive.
Trivia: Max von Sydow's costume for the Emperor Ming weighed over 70 pounds and he could only stand in it for a few minutes at a time.
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Answer: Since one meaning of "bore" has to due with digging tunnels and they are used in the torture scene, one can assume that they are worms that eat holes into your flesh.