Continuity mistake: The pilot hands Flash a People magazine to sign. When Flash sits down to autograph it, one can see it's already signed (seemingly from previous takes). Then he scribbles on the same spot again.
Flash Gordon (1980)
21 pictures
Directed by: Mike Hodges
Starring: Max von Sydow, Sam J. Jones, Topol, Melody Anderson
Revealing mistake: When Biro stabs the Imperial soldier with his sword, it's obvious that the sword is angled to miss his body. (01:30:50)
Dale Arden: I'm a New York City girl. It's a little too quiet around here for me.
Trivia: The tree person that gets locked into the cage with Flash (Fico by IMDB credit list), that "stole" the key to the cage, is Richard O'Brien, who is known for creating the Rocky Horror Show.
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.