Other mistake: As Dark Helmet says his line "Everybody knows that!", watch the crewman in white to Helmet's right. He starts to cover his crotch a beat too soon.
Other mistake: When Yogurt comes out of his statue the camera zooms in and the door starts to close, but when the camera zooms out the door starts back and closes again.
Other mistake: When Lone Starr drops the statue of Yogurt on Barf's foot, the statue actually lands beside his foot.
Other mistake: When Dark Helmet kills the crew member, he chops straight down the man's right side, but the slash mark shows a right-to-left downward slice.
Answer: "There are two sides to every sword" is a common saying.
Grumpy Scot