Wat-son your screen, Dr? Sherlock viewers left scratching their heads by epic blunder… as series return draws in best audience of New Year’s Day There was an impressive audience of 8.1 million tuning for the Series 4 return of Sherlock , on Sunday – this year’s best figures for a New Year’s Day show. So the programme was never going to be far from critique, in particular one especially hard-to-spot blunder in a scene featuring Dr Watson.