Since the left picture has a shallow depth of field, is it a typo that the left picture was taken with f/4 instead of f/11? Sorry if this was covered in person.

To minos-cs184: I don't think this is a typo. The slide before this also compares depths of field, where the blurrier background (shallow depth of field) image has aperture $f/4$ and the clearer images have smaller apertures $f/11$ and $f/32$. This is similar to the example in this slide, where the blurrier background image has larger aperture $f/4$ and the clearer background image has smaller aperture $f/11$.

Larger aperture means smaller shutter time for the same amount of exposure, which produces blurrier background (shallow depth of field), so this means $N$ in $A=\frac{f}{N}$ is smaller (and less motion blur, which applies more to example on previous slide and not this slide).

Smaller aperture gives the opposite result.