In the opening shot, horse drawn carriages travel along a London street. The film begins in the 1890s but the road is smoothly tarmacked, a surface treatment invented in 1902 and only commercialised some years later.
In the train tunnel, Jim is lying on the third rail and Dorian touches him but neither are electrocuted.
When Dorian is fighting Jim in the train station tunnel, the sleepers and spikes are visible. The spikes seen were not in use in 1890 when the novel was written, nor the era when the film is set.
Trilbys started as a hat in the 1930s. Gray wears one.