Revealing mistake: At the ball when Carl pushes the man spitting fire so that he spits fire on Dracula, you can see Dracula grabbing him and throwing him away. Then it cuts to Van Helsing gliding down on a rope grabbing Anna. When we get to the scene where the camera view comes flying against Anna we can see, on the left, Dracula's shadow when he is throwing the man. As the previous scene where Dracula threw away the man was most likely done with CGI, they forgot to add the man's shadow in this scene. Also in the following scene you can see Dracula throwing, but this time they forgot to add the man in. (01:23:35)Mortug
Factual error: When Van Helsing goes to Rome, the subtitle refers to the Vatican as "Vatican City". By the 1880's the Pope had lost all his temporal power, and his previous lands (The Papal States) were taken by the new Italy. The Vatican had no lands or authority over any of Italy or Rome. The Pope was a virtual prisoner inside the Vatican. Only with the Lateran treaty in 1929 (with Mussolini) did the Vatican gain independence as the "State of Vatican City". (00:13:10)
Factual error: In the beginning of the scene after Van Helsing kills off one of the three female vampires, there is a map behind Friar Carl depicting the whole of the Carpathian basin, which, at the time, included the Austro-Hungarian empire as well as a part of Romania. However, the whole area is labeled "Transylvania", which is only a region of Romania.
Revealing mistake: When Velkan and the werewolf has dived off the cliff, we get a shot behind Anna where she is looking down the cliff. It cuts to a front shot of her and back behind her again and you can see it's actually the same scene played over again. You can easily see it on how her hair moves in the wind. (00:22:00)Mortug
Factual error: On the map, Budapest is indicated to be just as large as Transylvania, or at least of the same size category. Apart from Budapest being only a city and Transylvania a pretty large county, Budapest (taking its 19th century size) is not more than 500 square kilometres while the Transylvanian region is circa 57000 square kilometres. (01:11:40)
Revealing mistake: At the windmill when the fire reaches the cases with Absinthe bottles the cases explode. Howeverm when the explosion occurs we can see sparks. I'm pretty sure an explosion like this wouldn't produce sparks, so it's obvious the explosion was ignited by some explosives. (00:05:35)Mortug
Continuity mistake: Near the end of the attack of the Brides, Marishka is about to make her final "charge". The wind blows the hair back from her face, showing that she is not wearing any earrings. Yet after Van Helsing kills her and she starts to disintegrate, she is wearing large triangular dangling earrings. (It's not because her jewelry disappears in her flying form - she is shown wearing bracelets and rings in *both* forms).