Oh How We Met the Night That We Danced - S1-E5
Other mistake: When Rob is dancing with Laura and is supposed to step on her foot, his foot lands so far away from hers, it doesn't even appear that he stepped on it.
Other mistake: Laura tells Rob "oh you don't smoke!" But in several (double digit) episodes Rob not only has a lighter but also a cigarette in his hand or mouth. One episode while he and Laura are illegally about to eavesdrop he puts out the cigarette on the speaker causing the speaker to turn on and they start eavesdropping again.
