The series, which focuses on the exploits of a noble family in the early 19th Century, was renewed for a second season earlier this week.
Based on the first in a series of Bridgerton novels by Julia Quinn, season one is set in the year 1813.
However in some of the very first shots of the opening episode, viewers are able to see painted yellow lines on the road outside Bath’s Royal Crescent.
Given that characters were still travelling around by horse-drawn carriage, there’s no way that the inclusion would have been historically accurate or, we can presume, intentional.
Viewers flagged the error on social media, sharing screenshots of the offending anachronism.
One person wrote: “Really enjoying Bridgerton, but with the technology available to film makers these days, a yellow line?”
“Just spotted that too,” wrote another. “Entire London in CGI but couldn't matte out that!”
Other viewers have identified other historical anachronisms in the series, including the presence of seedless grapes and a modern doorbell.
“Two episodes into #Bridgerton and I've so far spotted a single yellow line and a telecoms manhole cover,” noted another viewer. “I didn't realise the 19th Century Brits were such pioneers...”
The first season of Bridgerton can be watched now on Netflix.
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