Did you spot this?

The Duke and Duchess of Cambridge, Kate and William, released their annual Christmas card during the week. Lots of comments were made; people admiring Kate's outfit and others doting over George and Charlotte. But, while the photo was probably planned for weeks, and very carefully at that, people have noticed a fairly glaring error - Kate has no right arm. William has both his hands on George's shoulders, while Kate only has one hand on view, placed be by her side, with the other one completely missing. She has it placed behind Will's back but you cannot even see her elbow or upper arm, which adds to the illusion. Possibly too much photoshop?

The Duke and Duchess of Cambridge are pleased to share a new photograph of their family. The image features on Their Royal Highnesses' Christmas card this year. The photograph was taken earlier this year by @ChrisJack_Getty at Kensington Palace. pic.twitter.com/p8jm6zDfl0

— Kensington Palace (@KensingtonRoyal) December 18, 2017

People have been quick to comment:

The Duke and Duchess of Cambridge are pleased to share a new photograph of their family. The image features on Their Royal Highnesses' Christmas card this year. The photograph was taken earlier this year by @ChrisJack_Getty at Kensington Palace. pic.twitter.com/p8jm6zDfl0

— Kensington Palace (@KensingtonRoyal) December 18, 2017

The Duke and Duchess of Cambridge are pleased to share a new photograph of their family. The image features on Their Royal Highnesses' Christmas card this year. The photograph was taken earlier this year by @ChrisJack_Getty at Kensington Palace. pic.twitter.com/p8jm6zDfl0

— Kensington Palace (@KensingtonRoyal) December 18, 2017

I wonder where Kate's right hand is!?! ?

— Josie (@jbe112995) December 18, 2017