The bishop is wearing incorrect liturgical vestments. He is shown wearing a dalmatic which is the vestment for a deacon with a stole worn 'priest-wise' on top. A french bishop of this period would have worn a 'fiddle-back' Latin chasuble with crossed stole underneath.
When a young child hops on the back of a horse drawn wagon, very clear views are given of the caliper disc brakes on the rear axle of the wagon. Brakes like this were not used until 1890 at the earliest.
The following FAQ entries may contain spoilers. Only the biggest ones (if any) will be covered with spoiler tags. Spoiler tags have been used sparingly in order to make the page more readable.
Why did someone want to buy Fantine's teeth?
In the novel, Fantine was shown to have perfect white teeth, which would have been desirable for making false teeth.
Why did Cosette have to go all the way into the forest for water?
According to the novel, water was rare in Montfermeil. It was necessary to fetch it from a bigger distance. During the day, people in Montfermeil paid to a special person do it, after his "working hours," they had to do it themselves (or wait until the next day).