Irene Adler: Why are you always so suspicious?
Sherlock Holmes: Should I answer chronologically or alphabetically?
When Holmes and Watson are in jail, close-ups of Jude Law reveal a hearing aid in his left ear.
In the scene with the French Giant all of the French lines they speak were originally in English. Director Guy Ritchie found out that the man actually spoke French as his first language and decided on the spot to change it to add to the mystery of the film.