Continuity mistake: Near the end, when Scotty is driving Judy to the Mission, the view from inside the car of the road shows that Scotty is driving on the left-hand side when he should legally be on the right. It is not a one-way road, and it appears that the shot was flipped.
Other mistake: After Van Helsing realises Dracula's coffin is in the cellar of Michael Gough's house, he hears a scream and runs to find the housekeeper Gerda overwrought and hysterical. He needs to find out where Dracula has just gone, and so he gives her a slap. It's hilarious how loud the sound of this is.
Continuity mistake: When Quinlan is with Joe Grandi at the bar, Quinlan breaks his sobriety while seated at a round table, but in the last overhead shot the table is rectangular. (00:57:00 - 00:58:25)
Continuity mistake: In the scene towards the beginning where pair- chained interracial prison escapees Noah Cullen and Joe Jackson (Sidney Poitier and Tony Curtis) are trying to cross a river together without killing each other, they get carried away downstream and are stopped by a tree. The mistake is, Sidney Poitier's bald headed stunt double is noticeable losing control while floating downstream, visibly and audibly crashing head first into the tree. He is briefly flailing and struggling from the unexpected impact until Sidney Poitier reappears properly floating towards the tree without struggle. This mistake is less than 30 seconds and is awesomely noticeable best on Blu-Ray disc. The shot of Tony pulling Sidney out of the river concludes the scene.