There were a couple of things in this episode that showed Malcolm acting like a genius at the age of four, such as playing with a chemistry set. However, until the pilot episode (which was when he was 11/12), no one had any idea and it was presumed that he acted like the other kids, not playing with science equipment.
During the cold open, just after the ball is thrown into the sewer, a lighting rig can be viewed quite clearly to the left of the screen.
Goof: In the flashback prior to Malcolm's birth, toddler Reese is 2 years old and has blue eyes. But Reese is supposed to be a little more than 1 year old than Malcolm and has brown eyes.
When Lois goes into labor with Malcolm, she runs outside taking Francis and Reese with her. When Francis says "You're a liar, you're a liar!" watch the back window of the car and you will see the camera and camera operator reflection in the window.
(Chlorine gas is inside the house due to Malcolm's experiment)
Lois: I'm having a baby.
Hal: Oh. Well. That's good. Because the car keys are inside the house! So, I can either suffocate by going back in there to get them or you can have another baby out here on the lawn!
Hal: What's going on?
Neighbor: Your wife just gave birth on your front lawn. Congratulations, I guess.
(Hal walks inside the house with Reese)
Lois: (to herself) Ah great, ignore the eighth month pregnant woman carrying the boxes.
(Lois is giving birth to Reese. She yelps in pain)
Hal: Another contraction?
Lois: (in pain) No, he's kicking me in between contractions. What the hell is with this kid?
Hal: I have been the leader in sales for this company for five years running, no one has ever done that before. And all I'm asking is to cut back on my hours, just a little tiny bit, so I help out at home. You have kids. You know how it is.
Hal's Boss: Absolutely, Hal. Don't worry. We'll find a way to make this work.
(cut to next scene, where Hal's desk is right next to the toilet entrance)
Hal: What do you want from me? I'm only human.
Lois: Oh, please. The minute you crossed that threshold into the bedroom, you became more beast than man!
Francis: How long does it take to get me a soda, Dewey?
Dewey: Mom and Dad are fighting.
Francis: Really? Well don't worry, Chief. Everything will be fine. Trust me. You know what'll take your mind off it? Making me a sandwich.
Lois: Why don't you take that stick and shove it up your...
Dewey: (from inside, takes two banana pieces and plugs it in his ears)
Hal: Want the rest of my Slurpee?
Lois: Leave me alone, Hal!
Lois: (crying in pain) I'm having a baby!
Woman: (jogging) Congratulations!
Hal: (sees an angry Lois) Okay, let's hear it! This has to be my fault somehow. So, go ahead. Say it, come on. I'm the cause of all that is bad in the universe. Everything that I touch turns to crap. And now... (screams) ... I BRING YOU RAIN!!!! (thunder)
(young Reese has a ball in his mouth as Hal is taking it out)
Hal: Oh, for God's sake, hold still.
Lois: That's not gonna work. Drive him to the emergency room.
Hal: We do not need to got to the emergency room.
Lois: You're gonna force it further in his mouth and he's gonna CHOKE TO DEATH!!!!
Lois: You're always telling him about tales of your wild youth.
Hal: Those are cautionary tales.
Lois: Cautionary tales do not end with "It was so cool!"
Hal: (to Malcolm) Malcolm, will you please pick up your stuff! (to Lois) What is a 4-year-old doing with a microscope, anyways?
Malcolm: How can I put this in a way you'll understand... SHUT UP!
Doctor: (newborn Reese kicks) My God... he kicked me in the nose!!
Lois: You put the baby in the closet?
Hal: You left the milk out on the counter?
Reese: (looking at the bug zapper) Ha, ha, stupid bug. (sticks his finger inside the bug zapper and zaps himself) Ahhh, stupid... (punches the bug zapper and injures his hand)
Francis: (outside the bedroom door) Mom, can I have the last--
Lois: Go away!
Lois: (to baby Francis) I'm never gonna let you out of my sight.
(Hal is trying to educate 2-year-old Reese)
Hal (singing to the tune of 1812 overture): Art / Mona Lisa was by Da Vinci / Science / The Radio was made by Marconi /Math / 9 is the product of 3 times 3 / Natural Science / Darwin once said we all come from monkeys / BUT NOT Literally.
Lois (9 months pregnant with Malcolm): Someone's benefiting from that, and it's not Reese.
(close-up of Lois' enlarged chest)
Lois: He's two years old and still calls you "phone".
Young Reese: Phone go bye-bye.
4-year-old Malcolm: I tried to make invisible ink, but I think I made chlorine gas.
This episode was nominated for a Emmy Award for Outstanding Directing for a Comedy Series.
Cold Open: Malcolm and Reese trick Dewey into grabbing a tennis ball when it falls down the sewer, and never playing with him after he gets it.
The scare Lois and Hal have that made this episode comes true in season 4.
Noteworthy Relevations: Francis was born at Lois and Hal's wedding, Hal got a severe cutback at work, Hal was inadvertently responsible for making Malcolm a genius, and Lois had both Malcolm and Dewey at home.
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