Continuity mistake: Younger Mary's a blond with blue eyes whereas on The Big Bang Theory she has brown hair and brown eyes.

Young Sheldon (2017)
1 continuity mistake in show generally - chronological order
Starring: Danielle Pinnock, Doc Farrow, Wyatt McClure
Genres: Comedy
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 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.
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?
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Answer: Mary is highly religious and completely against any form of alcohol as shown in Big Bang Theory numerous times.
Ssiscool