The first known appearance of Sherlock Holmes on film was in Sherlock Holmes Baffled which was created in 1900. It was a 30 second silent film in which Holmes attempts to capture a thief raiding what is presumably
Baker Street. Every time Holmes gets
close the thief vanishes.
|Holmes on the right (just in case it wasn't clear)|
So Holmes’s first film outing had an emphasis on special-effects and action, no deduction of any note took place and there was very little to link it to the source material apart from the name of the character.
We must consider ourselves lucky that no one does that these days.