Episode #4.5 - S4-E5
Factual error: When Lady Edith visits a Harley Street doctor his nameplate is shown outside his surgery. His name is prefixed with "Dr." However, one of his post-nominal qualifications is "FRCS." As a Fellow of the Royal College of Surgeons, his name should be prefixed with "Mr.", as with all qualified surgeons in the British Isles.
Answer: Although this looks a bit like Bates with a similar build and darker coloring, it is actually Lady Violet Crawley's butler, Spratt, who is showing them into the drawing room. They are meeting at Violet's house to talk with Dr. Clarkson about Sybil's death. Also, Bates was never a butler, he was a valet, and would never be the one to show people into a drawing room or anywhere else. Servants' roles and duties were strictly defined.
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