Corrected entry: As the vortex is going through, Frankenstein's monster is saying goodbye to Phoebe, while Phoebe is pleading with him to stay. At one point Phoebe is holding Frankenstein's monster with both hands. Then after he gets sucked into the vortex, she throws him her stuffed dog. How can she hold the monster with both hand and still keep the stuffed dog without it going into the vortex?
Corrected entry: The opening scenes with Van Helsing take place 100 years before the story begins, so 1887. The events of Dracula are accepted as having occurred in 1897. So either Van Helsing didn't get sucked into the portal, took part in the book's events, and hung around for 90 more years to pull Dracula into the vortex at the end of the film (unlikely). OR he did get sucked into the vortex, and came back out to drag Dracula in, but that means he could not have taken part in Bram Stoker's novel.
Corrected entry: They make a big scene that a virgin is needed to read the text from Van Helsing's diary in order to get rid of the monsters. After Patrick's sister fails because it turns out she isn't a virgin, everyone freaks out until they realize Phoebe could help them out. Not once is it mentioned the virgin had to be a female. So why couldn't the 12 year old boys read from the diary and get rid of the monsters?