The Ford convertible that Tom drives is shown with a plastic rear window when in reality, it would have been glass.
When Lady Rose meets Atticus for the first time, they stand outside Bettys Tea Room in York. Although this season is set in the 1920s, the shop sign shows the name Bettys without the apostrophe although, according to the FAQs on the company's website, this change was not made until around the 1960s.