This message was on the wall at 3 Lauriston Gardens, the site of Enoch J Drebber's murder in A Study in Scarlet. Lestrade thought it that the writer was trying to write 'Rachel', but Holmes had other ideas.

 

Holmes gave the King of Bohemia a receipt, scribbled on a sheet of note paper, for the £1000 that the king had given him for expenses. (A Scandal in Bohemia)

 

Holmes used a little red paint in the palm of his hand which wiped onto his forehead to help him gain entrance to Irene Adler's house. (A Scandal in Bohemia)

 

Dr Watson and Holmes often took a revolver with them on a case, one of these times was when Holmes took his revolver to protect Miss Mary Morstan when she was to meet her mysterious benefactor at the Lyceum Theatre. (The Sign of Four)

 

The King of Bohemia offered Holmes an emerald snake ring in payment for his work with Irene Adler. Holmes refused it, asking for the photograph of 'the' woman instead. (A Scandal in Bohemia)

 

Enoch J. Drebber was carrying a Russian leather cardcase with cards for 'Enoch J. Drebber of Cleveland'. (A Study in Scarlet)