The series is considered to present the most faithful screen adaptations of many of the Holmes stories, although liberties were taken with some plotlines and characters, particularly later in the run during the 1990s episodes (for instance "The Mazarin Stone", filmed in 1994, combined the plot elements of two separate Conan Doyle stories). A big change was Holmes quitting his cocaine habit in the episode "The Devil's Foot," which was done with the approval of Conan Doyle's daughter, when it was discovered that the series had a considerable child audience. Nonetheless, the series has been highly praised for the performance of Jeremy Brett, its adherence to Doyle's original concept in the characterisation of Watson, its high production values, and its close attention to period detail.