Can you spot the mistake in this picture?

Can you see the mistake in the picture?

Here is a type of puzzle that has recently become very popular around the web.

Below, you’ll see a picture, which at first glance, looks completely normal. But there is something wrong with it. Can you see it?

Are you ready? Here comes the picture.

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ANSWER:
Here is the correct answer

At first, you might think that everything in the picture is correct. But after a few moments, you might be able to identify the actual mistake in the picture. The mistake is hidden inside the teacup of the boy.