I've 120-Starred this game no fewer than 3 times over the years, and I only knew about, like, two of these. Ha!
I suffered through this gimboid's video to honestly confirm that, yes, I know all of these warps.
lol
Just saw this video and kind of expected there might be some I didn't know about, and yeah, pretty sure a few of these are pretty obscure. Like why would you ever need the Snowman's Land one? You know, thinking about it, are modern Mario games missing really deep secrets like this? Teleports, secret exits, warps to the final world? There's the kind of obligatory warp pipes in a few modern Mario games, but they feel extremely token nowadays. I guess they'd be totally blown out in online videos immediately but some of these are pretty tough to find. Anything mysterious I'm not thinking of?