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 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: 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.
David, Goliath, and a Yoo-Hoo from the Back - S2-E14
Question: When Missy is with Meemaw, and she tells her that after she was born the doctors didn't think she was going to make it at one point. What did she mean by that? Was Missy born with problems or something?
Answer: My guess is that something happened either during her birth or after she was born. Some twins are born early and can have problems with breathing after being born.
Question: Is Sheldon's behavior the reason Missy has a hatred for him?
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.
Answer: Some people just have a dislike for someone that can't be explained. Could be as simple as the way he's dressed.