Revealing mistake: When the ghost army starts to move, the wires holding the drum sticks are visible.
Continuity mistake: During the soccer match, the second time Prof. Brown is run over, the amount of mud on his leg decreases in less than half a second.
Continuity mistake: While waiting for Ms. Price to arrive, Carrie's fringe haircut differs totally between the wide and close-shots.
Continuity mistake: After the opening credits, the long shadow that crosses the road disappears in the close-up.
Continuity mistake: When Ms. Price first appears on screen the road suddenly becomes soaked in water.
Continuity mistake: At the end of the film, Paul holds the bedknob and its colour changes from black to golden in less than half a second.
Continuity mistake: When Prof. Brown climbs on the bed for the first time, the position of his left hand differs between angles.
Continuity mistake: During the soccer match, the first time Prof. Brown is ran over, the number of footprints on his shorts differs between the first shot and the one following the vultures with the stretcher.
Audio problem: The Lion King kicks the hyena's butt and sends the animal flying away and cracking up. For brief seconds and a couple of times the hyena is serious and with the mouth closed but the laugh persists.
Visible crew/equipment: After the cat hisses at the children and Miss Price says they startled him, the cat is shown moaning and you can see a shadow moving across its head. It's not Miss Price, as she is up on the stairs, and it's not the children, as they are not close enough and are trying to keep their distance as they move towards the stairs. This is likely a crew member moving toward the cat in order to get it to react. (00:10:10)
Character mistake: The Pepperinge Eye post office displays a sign saying "licenses issued." In British English the spelling should be "licences". (00:06:25)
Continuity mistake: When Miss Price and the children are first en-route to London on the bed, Paul is holding his cap in some shots (from the side and front) and not at all in the shots from behind him and his sister.
Factual error: At Portobello Market, when the kids are eating, there's a sign that reads "cookies." No chance there would have been anything like that in 40's London. It would definitely have read "biscuits."
Other mistake: The interiors of Miss Price's house is definitely not from a British country house. The ground floor looks more like an American 70's house.
Continuity mistake: When the old bookseller is telling the story of Astoroth, the position of Ms Price and Mr Brown's hands on the broken book differs between the wide shot and the close-ups.
Answer: Don't know what it was like in the forties, but we were there in 2010. Wonderful place to visit. So animated. Not only were their vendors, but there were Street entertainers as well. What I found amusing was before you get to the part of Portobello Road where there were these vendors, you had to go past the stately homes with gated grounds. Expensive cars with pull into the drives. Wouldn't happen here in the United States.