'The Crown' Fans Spot a Mouse Running into a Scene on the Drama Series — See the Reactions

Social media was taken over by curious fans of Netflix's "The Crown," who noticed a stray mouse running into a scene in new episodes of the fourth season of the drama series.

Season four of "The Crown" premiered on November 15, and barely a week after its return, the royal drama series is already making waves on the internet, but not for the reasons one might think.

After watching the third episode of the new season, viewers were treated to a surprise cameo when they spotted a mouse running into a scene in the House of Windsor.

The creature was seen darting across Buckingham Palace in front of the Queen Mother, which was played by actress Marion Bailey. The odd sight immediately sparked reactions from the eagled-eyed audience who took to Twitter to share their responses.

According to reports, the fourth season of "The Crown" will cover the years 1979 to 1990

One user asked if the feature by the royal mouse was on purpose as rats are sometimes seen in the tidiest and luxurious places in the world. Another fan insinuated something similar, asking:

"Watching new season, "The Crown." Was that mouse that ran across the screen supposed to be there? Did someone not catch that in editing."

The official Twitter account of "The Crown" took charge of the matter and replied to an account who asked about the rat, giving the rodent the title of "Outstanding Guest Actor In A Drama Series." Other viewers suggested that the rat wasn't a coincidence but rather represented a hidden message.

There are theories that the rodent represents all the chaos that entered the royal family when Princess Diana became a part of the family as the episode, in particular, focuses on Prince Charles' proposal to Princess Diana and his affair with Camilla Parker-Bowles.

According to reports, the fourth season of "The Crown" will cover the years 1979 to 1990 and focus on Margaret Thatcher's regime as prime minister and her tumultuous relationship with the Queen. Prince Charles and Diana's controversial marriage is also explored.

Many of the cast of season three returned in the new season with only a few new additions. Newbie actress Emma Corrin reprises Princess Diana while Josh O'Conner plays Prince Charles. Gillian Anderson plays Margaret Thatcher, and finally, Erin Doherty portrays a young Princess Anne.

Before the new season's premiere, eagle-eyed fans had already spotted errors in the promo photo released in September. In an image of Emma Corrin replicating Diana's run-in with the paparazzi in London while wearing a yellow outfit, they noticed a red modern-day Routemaster bus.

The vehicle couldn't have been there during Diana's time as it was only introduced into the United Kingdom in 2012 by former mayor of London and present Prime Minister, Boris Johnson.