Rockets, Communists, and the Dewey Decimal System - S1-E2
Other mistake: As Young Sheldon is a prequel series to Big Bang Theory, this episode is at odds with episode 2-13 of Big Bang Theory, "The Friendship Algorithm," in which Sheldon is unfamiliar with books like "How to Make Friends and Influence People," which he reads in this episode of Young Sheldon, produced nine years later but taking place twenty years earlier.
A Solar Calculator, a Game Ball, and a Cheerleader's Bosom - S1-E5
Factual error: The commentary suggests that Sheldon had the correct solution to problem 1 and merely lost points on the quiz because he didn't show his work. In reality he did the first problem incorrectly. Taking the derivative of (x+2) ^2+ (y+1) ^2 = 13 with respect to x yields: 2* (x+2) +2* (y+1) * (dy/dx) = 0 which implies that: dy/dx = - (x+2) / (y+1) and at the point (0,2) this means that the slope dy/dx is actually equal to - (2/3), not 2/3. It is correct that when using the form y=mx+b at the point 0,2 reveals that 2=m*0+b, or that b=2. So the correct equation for the tangent line is y = - (2/3) x + 2, not y = (2/3) x + 2 as shown in the episode. (00:13:55)
A Baby Tooth and the Egyptian God of Knowledge - S3-E20
Factual error: Georgie removes his stash of cash from the air vent in his bedroom (envelope with a photo of a mustang taped to it) and the cash ($20 bills) have a serial # starting with the letter "C" which is a series of bills that were not printed until 2001. (00:15:14)
Trivia: Zoe Perry, who plays Sheldon's mother Mary, is the daughter of Laurie Metcalf, who plays Mary on The Big Bang Theory.
A Crisis of Faith and Octopus Aliens - S2-E3
Trivia: The exterior of the church in this episode is the same church used in the show "7th Heaven." It is located in Studio City, California.
Trivia: Sheldon's dad, George Sr, is played by Lance Barber. Barber appeared in as episode of "The Big Bang Theory" as a former bully of Leonard, Jimmy Speckerman. Sheldon (and the gang) go with Leonard to meet Jimmy.
A Computer, a Plastic Pony, and a Case of Beer - S1-E12
George Sr.: So just to be clear, my money is our money but your money is your money?
Mary: Correct.
A Computer, a Plastic Pony, and a Case of Beer - S1-E12
George Jr.: Woah, someone woke up on the wrong side of the bed. And you had both sides to choose from.
Jiu-Jitsu, Bubble Wrap, and Yoo-Hoo - S1-E17
Question: Why does the girl who keeps going after Sheldon go after him at all? She looks at him like she just hates his guts and would love to kill him, but why? I know that bullies go after the weaker people but she seems to act like Sheldon ruined her life or something.
A Therapist, a Comic Book, and a Breakfast Sausage - S1-E4
Question: Did Mary really think that telling Georgie Jr. Sheldon was getting a haircut would work when they got back and he noticed Sheldon's hair was exactly the same?
Answer: It is shown numerous time in The Big Bang Theory and Young Sheldon that Georgir Jr is not the smartest kid going. They simply tell him Sheldon is getting a hair cut as it is believable. It's also shown that Sheldon has had the same style hair cut since he was 5. Since he is 9 in Young Sheldon, he's had the same style for over 4 years already. Easy to overlook that he hadn't actually had it cut after that long.
A Computer, a Plastic Pony, and a Case of Beer - S1-E12
Question: Why does Mary grab her kids and leave just because George bought beer? I know they were fighting a little about money the night before but George used his own money, so what does it matter?
Answer: Mary is highly religious and completely against any form of alcohol as shown in Big Bang Theory numerous times.
Answer: It's as simple as money is tight, it's not "George's money", it's the family's money so the expenditure was selfish.
Answer: It's because Mary is upset that George bought two cases, because it is a lot.
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Answer: Some people just have a dislike for someone that can't be explained. Could be as simple as the way he's dressed.