Originally Posted by Boz_Lowdownl:
“Going back to my original post on this matter, Rachel clearly ignored an easy way to correct a contestant's answer and instead did a far more complicated solution. This is fact, not subjective interpretation. I interpreted that as a mistake on her part which all the evidence in front of us, plus the way she has reacted to similar situations at other times, supports. For some reason only known to you, you decided to ignore all this evidence and postulate the theory that she hadn't in fact missed the easy option but for some bizarre reason which you have continuously failed to explain except with more and more strange and unlikely theories, she deliberately chose to ignore it and instead do the more complicated version. I do think you are getting the facts of what was shown on screen and your own opinions confused.”
I agree that it's often useful to show how a particular method could have been slightly tweaked to obtain the correct answer. But it's not a "mistake" not to do it. If she doesn't happen to have spotted that particular way herself because she's arrived at the answer a different way, she's often unlikely to spot it while she's writing down the (she's doing the sums, checking they haven't re-used numbers etc.)
That's all there is to it. It's not an error, or a mistake, and while it's obvious to you watching it home, it might not be if you were there talking to the contestant, interpreting their formula, writing it on the board, checking the validity etc.
You're wrong to say Carol always did it though

That's also a fact.