Continuity mistake: While Clark and Pete are playing basketball, in the wide shot Clark and Pete, and the side of the barn where the hoop is, are in full sunlight. When the shot zooms in Clark and the barn are now in shadow.
Continuity mistake: After Lionel finds out about the wire that Lex has been wearing, he sits down and tells Lex to get out. As Lex leaves, in the wide shot, Lionel drops his hands down to his lap. In the zoomed in shot Lionel's hands are up to his face as he plays with the wire. There was no time for him to make that move between shots.
Continuity mistake: As Emily lies on the ground unconscious after being hit with the water, she is first shown lying there with her right arm bent up and her hand up by her head. After a quick shot of Clark she now has her right hand down by her side.
Revealing mistake: Loder gets scared and tries to get away from Kara. He takes off down the road at a significant rate of speed. Kara uses her super speed to get in front of the car. Loder has to slam on his brakes to keep from hitting her. At the speed Loder was going at he should have either skidded to a stop or hit Kara with his car. Loder is able to stop his car without doing either.
Plot hole: When Kara realizes that Agent Loder is listening in on the conversation, she runs out to his car to stop him. She has Clark's ability of super speed which she uses to get over to Loder's car. As she runs she ends up running through a wooden fence and you can see, through the motion blur of her movement, she neither jumps over the fence or goes around it yet the fence never gets damaged from her running through it.
Audio problem: After Clark tells Lex why he didn't tell him that Lex's father killed his parents Clark finishes his line by saying "...I couldn't live with that." The camera jumps to Clark's right and you can see he says "I couldn't live with that" again only no sound is heard.
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.