Carl is left behind as Van Helsing chases Mr. Hyde, which leads to them doing battle on the train. Van Helsing travels a fair distance across London, but when the trains crash and Van Helsing dismounts the train, Carl pops up from out of nowhere. How did he get across London so quickly?
When the carriages have separated, originally Van Helsing is standing on the one with the speeding train attached to it and Mr Hyde on the one behind. In a following shot, involving the
train flying forward, Mr Hyde is where Van Helsing was and vice versa.
The size of the hot air balloon basket changes considerably during scenes.
This film is considered a prequel to live action film Van Helsing (2004). The characters of Carl and Van Helsing appear to have a working relationship already established in this story despite the fact that they are "first introduced" to each other in the live action film.
In the live-action film, Carl says he is not a field man and that he's never been out of the Abbey. In the prequel, Carl goes with Van Helsing to London with no fuss or argument.