~ In the scene where Sherlock examines Carl Powers' shoe in the lab, his solo shots were done on a separate day than the shots with John. They had to shoot part of the scene without Martin Freeman after he was injured from slipping on the icy steps of a production trailer.

~ The pilot and A Study in Pink were filmed a year apart.

~ Kirstie's rabbit was based off of Mark's husband's pet rabbit as a child.

~ Mark and Vinette Robinson (Sally) met while doing a play together, which was how she got the role of Sally. Mark dropped out of the play due to the death of his sister.

~ Benedict swims during filming because he wants Sherlock to look lean and muscular.

~ The Hound of Baskerville consisted of mostly night shoots.

~ Mark Gatiss learned to swim in Beth's Pool.

~ Benedict accidentally locked Mark and Sure Vertue out of the inn where the cast and crew were staying during the filming of The Hound of Baskerville and they had to spend the night in their car.

~ On the set of the 2009 movie Sherlock Holmes, Rachael McAdams didn't want to wear a tight corset so she would eat a huge breakfast of oatmeal or push her stomach out. She was eventually caught.

~ On the same set, Robert Maillet accidentally knocked out Robert Downey Jr. while filming a fight scene.