I noticed that in some video shots, Biden appeared very slightly larger than the President, when a different camera was on each one of them.
I scanned through the debate video, and checked for this when they used the two cameras to combine the President and Biden video in side-by-side video panels. When in this side-by-side mode, I checked the writing on the board behind each of them, and compared that writing. When comparing the same letters in the same words, it seemed to me that Biden's camera was using a slightly higher degree of close-up.
I think they made Biden appear slightly larger than the President.
Does anyone else see this?