From “Toy Story” through “Toy Story 4,” Pixar has revolutionized animation in its nearly three decades of existence.

A deep rewatch reveals how two sequels a decade apart capture different stages of growing up, from college to adulthood.

When I heard this clip making the rounds a couple of years back, I remember thinking that, after Toy Story 3, I should have been done myself. Much like I’ve made a conscious choice to ignore every ...