During Artemis' sword fight, the stuntman is initially wielding the sword in his left hand. As the fight progresses, he is wielding the sword in his right hand. (tt07485/The Night of the Big Blast)
The way Miklos attaches the electrodes to the corpse's ankles wouldn't work as the current would be blocked by the pants and boots between the electrodes and the skin.
The "corpse" Miklos wheels into Dr. Faustina's laboratory is still alive; one can see his chest moving up and down as he breathes.
As Miklos is about to attach electrodes to the corpse's head, the corpse lifts his head to assist Miklos.
At 5:10, the number 3 on the front of the train is backwards.
During the sword fight on the stairs, Artemus' stunt double's face is in plain view in several shots.
When the re-animated Artemus is walking past the cafe, and Lily gets up to talk to him, the street cleaner in the background is only pretending to sweep.
There were no high school proms in the 1870's.
During the party scene when Artie is looking for Jim, (leading up to the sword fight) the instrumental version of "When The Saints Go Marching In" is heard. The song was first published in 1896 under the title "When The Saints Are Marching In" by James Milton Black and Katharine E. Purvis.
After the Mother and Daughter break into the train carriage, a shadow of the boom mic swings across the top of the shot.
Artie puts on a mask to hide his identity before he leaves with his contact. When he turns and walks through the curtain, the mask accidentally falls off and hits the floor.
Jim arrives at a government building in New Orleans. Even though it is just before 10 at night, the flag is still being flown. Government agencies lower their flags before or at sunset (unless a flood light can be shown on it, this is NOT the case here).