In Super Mario Bros. section there are two different paths: "BGO" and "Background objects". Both of them lead to the same place.
Also, I can't seem to find some NPCs that come from "The Lakitus are throwing Lakitus!" tab, like that Airship piece, Iceblock container, Ludwig von Koopa's spinning Shell, player's NPCs (fireballs, ...) and some others.
Hopefully you can fix that, best of luck!