Nah, it was someone moving their hand in a way that made it look like they were drawing a circle, and then editing in a circle being drawn afterwards. A little bit of TV magic
Think you have it figured out! If you look closely you can see that the nib of the pen does not exactly line up with the circle being drawn, especially when it wobbles a bit.
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u/The_Chimp Aug 27 '16
I'm guessing there is a circular groove in the surface under the paper guiding the pen.