The colouration of this level is directly taken from Super Mario All-Stars's rendition of Super Mario Bros.'s course 1-2.
In this stage, the spikes which deal damage gleam with sparkling particles. This design innovation was directly taken from Giana Sisters DS.
The lava vents are directly inspired by the map 'SeaCaves' from Glider PRO.
Not shown in this picture: the first mailbox already has its flag raised, thus changing the meaning of the mailboxes from a fast-travel device to the mandatory path.
The exit pipe transports you to the goal, which is at the end of 1-1's map.