I think the big thing for me is that PatF is clearly set post-WWI, when we had the cultural shift of the Roaring 20s; Louis is a jazz trumpeter, Charlotte is clearly a half-step away from entering flapper-hood, electric streetcars are now rolling through the city, having replaced the old horse-drawn carts.
Even though Brother Bear takes place at the end of the last ice age (8,000-10,000 years ago) it still feels closer to the frontier than jazz music and electricity. Just remove the mammoths and it would easily double as the early 1800s Pacific Northwest.