Continuity mistake: When Clark is in hospital after being thrown to land on the roof of the car his mum is helping him put a shirt on. He puts it over his right shoulder and the shot changes, his arm is all of a sudden in the sleeve.

Smallville (2001)
1 continuity mistake in Leech - chronological order
Other mistake: Lois digs up Chloe's grave site to unearth her casket. It is obvious that the casket is not buried six feet deep. You would think, with all that is going on, that LuthorCorp would have at least buried the casket deeper to deter inquisitive eyes and maybe throw in a few scattered bones for good measure.
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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.