When Lucy is first staked, blood comes gushing out of her mouth and onto her cheeks. In the next scene there is just a slight bit of blood on her lips.
When Dracula flips over Lucy's coffin, the supposedly dead actress inside can clearly be seen to quickly raise her arms to cover her chest and face, presumably to shield herself from the fall.
When one of Dracula's Brides is being staked, it is revealed that she has metal fillings on her teeth.
At approximately 36:30, as Dracula hisses/snarls at the the people through the window, actor Jack Palance's dental work can clearly be seen.
At 1:12:23 Dracula is about to break into the bedroom by knocking down a locked door. The door jamb is already damaged and poorly repaired, weakened to allow Dracula his deed. At 1:12:50 the breach occurs and the jamb breaks at the point of previous repair.
In the novel, wolves are frequently mentioned, but in the film, the "wolves" are clearly German Shepherds.
When Mina is awakened from hypnosis near the end of the film, Mina's hair becomes see through when viewed from the side due to a green screen effect of a green lamp shade in the background.
As Van Helsing and Arthur journey to the George Hotel, they pass a Wine Ways, one of a chain of off
licence shops that were later folded into/became Victoria Wine. Wine Ways was not around in 1897.
Though explicitly set in the year 1897, the costumes portrayed (although Victorian-era) would have been wildly out of date by the turn of the century setting. The women are shown wearing the crinolines, bonnets, and sausage curls of the 1830s-1860s and the men appear to be garbed in 1840-ish fashions topped with 1970s hairstyles. Though perhaps intended to give the film a more old-fashioned feel, in real life they would have looked decades out of date and this would have been especially true for the upper-class women depicted for whom fashion was very important.
When Harker is climbing from the window of Castle Dracula, the safety wire is clearly visible.
When Dracula forces Jonathan Harker to write the letters saying he will spend some time in Europe before returning home, the head of a crew member can briefly be seen in the mirror in the background.
When Dracula hurls the man out of the upper story window of the hotel, the cushion that breaks the stuntman's fall can be briefly seen in the lower left corner of the screen.
The supposedly Hungarian innkeeper and his wife who greet Jonathan Harker in the opening scene speak Russian.
Even though the painting in Dracula's castle says 1475, the clothes in the painting and the execution of the painting, as well as Dracula's memories of the woman in the painting, clearly show fashion that was worn centuries later.