Eagle-Eyed Fans Noticed a Huge 'Big Bang Theory' and 'Young Sheldon' Error

Major whoops on their part!
'The Big Bang Theory' and 'Young Sheldon' overlap in many ways, but as fans have pointed out, there's one huge mistake. See what 'BBT' fans are saying about a past episode, even though 'The Big Bang Theory' is in season 12.

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