Revealing mistake: There is a scene which features a nighttime view of Carfax Abbey, Dracula's home. This movie was set in the late 1800's/early 1900's, but if you look closely at the left-hand portion of the screen, you will see the lights of an airplane as it flies in the skies above the castle.
Continuity mistake: Lupin's car windows are blown away in the car chase, and he and Gingen break all the remaining shards of glass from them. They then return again when lupin pulls up to the princess' car, then disappear in the following shot.
Continuity mistake: When Halloran sets the barn on fire to distract the Germans he lights up some straw with a match. All of a sudden you see flames flickering up at various places which could not be caused by the fire he made. (01:32:45)
Plot hole: When Jack The Ripper checks his watch before confronting H.G. Wells and demanding the key, the hands point to 8:50, the ensuing chase to the museum and demise of the Ripper may have used up a half hour or so, yet the time on the wall clock indicates that it is midnight.
Suggested correction: Movie time and real time don't match, so 3 hours has passed without all 3 hours being shown. The fact that the clock now shows midnight is meant to explain this fact without the need for subtitles to reveal the time.
Visible crew/equipment: If you look closely, you can see the camera and crew reflected in the cars passing while the camera follows Isaac running down the street.
Deliberate mistake: When George spies on his hedonistic neighbor down the hill with his telescope, the telescope is always level when it actually should have been pointing downward. Same when his neighbor spied on him - his telescope was always level also when it should have pointing upward.
Revealing mistake: When the boy accidentally hits the old man with the ball, he falls over. Note that you can see the stuntman's full head of hair as he hits the ground. When you return to the close-ups of the old man as he gets up, that extra hair is gone.
Continuity mistake: When Amanda rushes to get onto the bus to the train station, the door being opened is at the front LEFT of the bus (as viewed from the back). On arrival at the station (5 scenes later), the door opens at the front RIGHT of the bus (as viewed from the back), and in the second camera shot, the driver of the bus can be clearly seen sitting where the door Amanda used to board the bus would be, with no door there.
Continuity mistake: When Linda Blair deliberately knocks a plate of desserts into one of her suitor's lap, the tray hits him directly in the crotch and the camera shows this. Then there is a cut to Linda Blair's face and then a cut back to the boys clothing and the scene now shows the desserts all over his suit from the shoulders down.
Continuity mistake: When Tim goes to the pub to meet up with his father, he drinks his beer all the way down, emptying his glass. But when we see the glass next, it's half full.
Factual error: When they visit "Ireland", presumably the Irish Air Corps aerodrome in Dublin at the time of WWII, all of the staff in the bar at the aerodrome are American servicemen, in neutral Ireland.
Continuity mistake: In the sequence where the police are chasing Sonny on Rising Star through the field there are two close ups of an officer driving a car where the image is reversed (it appears like the car is right hand drive and the logo of his shoulder patch is reversed).
Factual error: Harry goes to the synagogue, to go through a register his grandfather's records. But he is holding the Talmud and not a register, which is entirely and Hebrew, and he's looking at it upside down. (01:05:00 - 01:06:00)