Animation refuge thread # 3

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Animation on Twitter, Tumblr and Youtube:
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#sakuga @ irc.rizon.net

One thing I wonder about this cut by Bahi: http://25.media.tumblr.com/329df447246e23e84c1975bf957185e8/tumblr_moyl0dMDbO1qanw3wo4_400.gif

In the last drawing the man's glasses look incredibly distorted compared to the previous ones, and even though it's just one drawing, it's really noticeable in motion and it gives a sense of cheapness to what is otherwise a well-animated scene:
http://i.imgur.com/Ru6Ciqe.jpg

I wonder why that is. Is the last frame just a bad in-between that wasn't drawn by Bahi, or is it just a detail that got overlooked?