Revealing mistake: There are times when it is quite evident that Michael Rosenbaum is voluntarily bald.
Continuity mistake: When Clark is at the table, when Lois is serving him dinner, she pours his beer into a glass and there's about 2 inches of foam on top, then it switches to a shot behind Clark and there's almost no foam on the beer. (00:09:10)
Martha Kent: Clark? What are you still doing out here?
Clark Kent: Well, I'm still doing my chores.
Martha Kent: Well, you usually finish those in about two minutes. How is it that I drove to Metropolis, attended the Children's Foundation dinner, and made it back before you finished?
Clark Kent: Because I'm doing them the normal way.
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Answer: No, there is no such character in the comics. He's a "meteor-freak" like all the other baddies on the show. The sound has something to do with him vibrating his vocal cords very fast to create a high-pitched squeal.