Clark Kent/Kal-El of Krypton
Alexander ('Lex') Joseph Luthor
When Sean is trying to get a girl to come over, he is trying to light matches but they keep freezing, yet the phone in his hand doesn't freeze.
When Sean goes into Jenna's bathroom while she is taking a shower, he is in desperate need of heat, yet the candles stay lit. It isn't until after he kills Jenna, and restores himself, that the candles freeze as he exits.
Right after Sean gets the football on the frozen lake, there is an aerial shot of him walking back to the shore as the ice starts cracking, and the frozen lake is covered with snow. In the next shot, when Sean falls through the ice, he is shown under the clear surface of the ice, as if there were no snow on it at all, or had been swept clear for the shot of his face under the ice.
Right after Shawn breaks out of the lake, he moves to the fire. We see in the first shot that his hands are right close to the fire. However, in the next shot, Shawn is bending down to get his hands close to the fire.
In the begining of the show, they're all at Crater Lake having a good time. The lake is completely frozen over, enough for someone Sean's size to walk around on. At the end of the episode, Clark sends Sean through the air and he lands in a pond in Lex's back yard...that doesn't even have the beginning stages of ice. Unless they had a heat wave strong enough to completely thaw the pond, there should be at least a little ice on Lex's pond.
When Shawn is kissing the girl (right after she comes out of the shower), she gasps when he is kissing her, right before her body turns into a solid block of ice. How could she gasp if her mouth wasn't open? Even if it were just a little bit open, the sound of the gasp would still be different.
When Sean freezes Jenna in her bathroom, you can clearly see that as he lets her fall backwards, she is quite pliable where his hands were holding her shoulders, so she couldn't have been frozen enough to shatter. Contrary to popular belief, a person who is frozen won't shatter when dropped. This can be easily verified by dropping a piece of frozen steak. The skin might crack because it is less pliant than before, but the muscle and bone tissues won't become glass(or ice)-like. Also, freezing a metal lock won't make it breakable by a human either. Freezing things makes them more rigid and less pliant--which won't affect metal much because it is already rigid and non-pliant. This can be verified by the Apollo moon modules which had to endure the freezing cold of space and then land on the moon safely.
In the final battle between Clark and Sean, Sean is in "frozen mode" but there is no blue makeup on the side of his neck in a couple of shots.
When Clark instantly figures out the family bills (see Quotes), the implication is that he has some kind of super-calculating mental ability - this has never been referred to before or since.
So...what happens to Sean? Is he still frozen in the middle of the lake near the Luthor mansion, or did the police or someone eventually show up, chip him out, and haul him off to the Asylum for Krypto-mutants? (We find out in the Smallville comic and the Chloe Chronicles Volume 2 that Sean is in a government research center but is barely alive and has a little bit of a heart beat. How official this is, isn't clear.)
When Whitney is driving Lana home, and they swerve to avoid Sean in the middle of the road, the dubbing of Lana saying "Whitney-look out!" doesn't match up with her lip movement.
If Sean escaped from an frozen lake once, couldn't he escape from the one that Clark trapped him in?
Clark: You deserved a lot better than Sean even before he...tried to kill you.
Chloe: That's sweet, I think.
Clark: Maybe I can help.
Jonathan: You already have. Last season you saved us four part-time hands.
Clark: No, I'm thinking bigger picture. You know, forget about this whole high school thing and try out for a pro sports team. I could make a ton of money in endorsements. (off his parent's stern looks) Just trying to lighten up the mood.
Martha: Much as we'd love to see your face on a cereal box, we'd settle for you getting to school on time.
Clark: I thought you came over for fashion advice.
(Clark shows her a shirt)
Chloe: Burn that. What else have you got?
Clark: I'll check the laundry basket.
Chloe: Are you from an ice planet? It's freezing. I'm going to go thaw out by the fire. Have fun.
Chloe: Don't sound so shocked, Clark. Guys do find me attractive even though I don't have raven hair and the initials "L.L."
Lex: A high school boyfriend isn't a husband; he's an obstacle.
Jonathan: We already talked about that.
Martha: I talked, you grunted.
Jonathan: I thought that I was rather articulate.
Clark: Hello, citizens.
Martha: I'm not familiar with this child. Where's the moody one? Lives upstairs, runs real fast?
Chloe: Your online horoscope suggests that you try not to flaunt your excitement which I know will be hard since you've been waiting for this date since, like your first growth spurt.
Clark: I'll say this one more time, and then I'll print up bumper stickers: this is not a date.
Pete: Clark Kent, international man of mystery.
Chloe: This is what I love about high school parties: people will gather anywhere as long as there's illegally purchased alcohol and even the slightest chance of hooking up.
Pete: I can't believe both your dates went straight to hell and I ended up with the limo.
Chloe: I'm swearing off men.
Clark: We're not all bad.
Pete: Maybe you should just swear off heat-sucking horn dogs.
Sean: If you want I could rub them for you; nothing heats up the body like friction.
Chloe: Wow. I can't believe you just delivered that line with a straight face.
Martha: The distributer gets 12.5.
Jonathan: Feed bill over 6 months at 5%
Martha: Plus the mortgage at 8.2 plus the harvester repairs gives us...
Clark: (instantly) $54,501.38.
Music: "Rescue" by Eve 6, "Standing Still" and "This Way" by Jewel, "Let Your Shoulder Fall" by Matthew Jay, "On Your Side" by Pete Yorn, and "We're At the Top of the World" by The Juliana Theory.
When Chloe and Clark are going through Clark's clothes, she tells him "blue's a good color on you." -Reference to his costume to come?
Originally advertised as "Freeze"
Even more in-jokes: Chloe comments she doesn't want to be a crash test dummy for the guys' dating lives. The band Crash Test Dummies put out a hit single about Superman.
When Lex approaches Martha Kent at her farm and she almost cuts him with a chainsaw, he comments apropro of nothing, "Good thing you didn't have an arc welder." In the TV show The Adventures of Lois & Clark, Martha Kent was an artist who used an arc welder to make metal sculptures.
In-joke: note Sean's last name, and the nature of his powers.
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