Just before Lord Milborne ("Uncle Francis") arrives, Lady Caroline is seen playing a pianoforte, but the sound heard during her playing is a harpsichord.
Wire fences are seen along the roadside during Lady Caroline's race. Wire fences were not used until several decades after this story takes place.
Asphalt is seen on the road in the scene when Lady Caroline arrives at Belgrave Village. Asphalt was not in use in England until several decades after this story takes place.