In [commit 6072ad4](6072ad4), @KajvanRijn kindly changed all "TO DO" to "TODO" in the code blocks. That's useful. In addition, it should be changed (as here) in the instructions. Then there's no doubt or issue for anyone searching all instances.
6072ad4
There is plot_all in Notebook 3.1, but it's enabled by default there, is out of place.