Other mistake: When Benjamin Dingle first steps into Connie Milligan's apartment, a closed bedroom door in the background inexplicably swings wide open on its own, right in the middle of the shot.
Other mistake: In this scene we see two scenes used twice in the film. Tarzan and Sandra are climbing up the rocky terrain and a few minutes later we see the same scene of them climbing up.
Other mistake: In 1902 at the German cafe, Kaunitz spits in Clive's face, and Clive promptly hits him, causing Kaunitz to fall down the steps. After this, several German students close behind Clive are wearing decorative ribbons to show their affiliations. The problem is the costuming department has used ribbons intended to mount miniature British medals for the 1914 or 1914-15 Star, British War Medal and Victory. These decorations didn't exist until 1918/1919 at the earliest. (00:36:01 - 00:38:01)
Other mistake: Despite the early scenes being set in Cardiff and its environs, not one character has a South Wales accent.
Other mistake: Holmes appears disguised as a Sikh, complete with turban and beard. Although his face is black, his hands are without any make up and are white as snow.