Not sure if this has been documented before, but I figured I might as well post this here just in case.
Simply put, on Japanese and PAL versions of DKC 3, taking the warp barrel in Springin' Spiders causes a No Squawks Sign to spawn near the exit.
This sign does NOT appear if you play through the level normally, and it doesn't seem to exist at all on North American carts.
Only found out about this today, so sorry if this has already been noted elsewhere, I couldn't seem to find anything regarding this.