In certain scenes, such as when Bingley proposes to take Jane to America, it is a sunny summer day, but you can clearly see Bingley's breath as on a cold winter day.
When Amanda is pleading to Mr. Darcy, there is a Boots across the street from which she can get medical supplies to save Mr. Bennet with. However, she also has no money and any Mr. Darcy carries with him would be out of date.
In the latter part of the movie, the roses are in full bloom, the characters are dressed for warm weather, yet you can see their breaths when they speak, indicating that the weather is actually very cold.
When Amanda and Mr Darcy both arrived in 21st century London, they instantly knew where Miss Elizabeth Bennet was babysitting without anyone having told them.