Jessica removes the book "A Treatise on the Black Mass" from her grandfather's library. A few minutes later her grandfather returns the book to its place on the shelf, only now almost all of the other surrounding book titles have changed.
The calendar in Johnny Alucard's apartment could be used for three months in the year 1972, but September, when the action takes place, is not one of them.
The action supposedly takes place over a Friday-Sunday in September, 1972. On the Friday night, Jessica says Lawrence Van Helsing died September 18, 100 years ago to the day, but that Friday in 1972 was September 15.
The yellow carriage spoke that punctured Draculas' heart in the opening scene and which "Johnny" placed into the ground with Dracula's ashes, seemingly remained untouched and unaffected by 100 years of London weather.
In the closing credits, Proffessor is mispelled.
Jessica refers to Lawrence Van Helsing as her great-grandfather. However, he was actually her great-great-grandfather.