We could have told special effects meister John Terwilliger that the only way to get a truly
monstrous
T. rex on film is to build a time machine, but alas, he relied solely on
stop-motion animation with no time travel, and look at the abuse he gets for his efforts from
the renowned producer Joe Clarence.
— Michael Main
Step by step, frame by frame of film, stop motion by stop motion, he, Terwilliger, had
run his beasts through their postures, moved each a fraction of an inch, photographed
them, moved them another hair, photographed them, for hours and days and months.