As BBT is usually very careful making sure things referenced on the show are accurate, especially when said by Sheldon, I wanted to start this thread for anyone who can find any inconsistencies or outright errors with anything Sheldon (or any other character) says.
Ill start off with an example I discovered the other day.
In S07E02 "The Boyfriend Complexity" Sheldon suggests to Penny that “with your Italian pizza and my Chinese noodles we could play Marco Polo." Marco Polo died in 1324. In S04E09 "The Deception Verification" while arguing with the pizza delivery man about walking up the stairs he states that “pizza dates back to the 16th century”. Therefore Marco Polo had already been dead for some 200 years before pizza was invented.
I am not trying to poke holes in or in any way diminish the show. I love BBT and Sheldon is my favourite character, I consider this an homage to Dr Cooper as I'm sure this is the kind of thing he would be correcting in his own beautifully condescending way.