Whilst Detective Bell is interrogating Proctor's brother, Irene says she has never seen the man before. Bell first names some of the weaponry Proctor had in his possession, as well as some fake passports, and the exact same speech is repeated in the background a few seconds later, when the main focus is brought back to the conversation involving Irene, Holmes, Watson and the Captain.
Contrary to what Irene said, yellow ochre (ocher in the U.S.) does not contain turmeric. It is well-known to be an earth-based pigment (which J.M.W. Turner did use).
Yellow ochre is made from iron hydroxide, not turmeric.
At 20:29 the camera man in a blue shirt is visible outside the door from inside the house. He must have been recording the previous shot.
Irene also suggests that The Fighting Temeraire was painted the year the Afghan War broke out (1839), when it was actually painted the year before (and if they were studies, specifically on September 5th or 6th 1838). The painting was exhibited in 1839.