Immediately after the initial fight with the Colonel's guards, West's suit is dirty and dusty, and his hair is disheveled. When he enters the office, his suit is cleaned and pressed, and his hair is perfectly combed.
When West and Gordon are discussing closing the cast, the tower West is building changes height substantially between shots.
Jim West is building a tower with matches he picks it up at the end of the scene and throws it to Arty. The matches he puts on do not fall off.
When Lavendor removes the bandage from the killer's face, it's obviously an elastic bandage.
Elastic bandages didn't exist until 1914.
When investigating the death of Claudio Antille, West and Gordon, the casket shown in the mausoleum is not of the type used in the late 1800's. While individuals could purchase ornate caskets, with fancy mouldings and handles, the lid of the casket was flat. The classic domed casket lid we're so familiar with today is was introduced much later.