Development on EarthBound took place as a joint effort between Ape, Inc. and HAL Laboratory, Inc. and was designed by Shigesato Itoi. The total development time for the project was five years, much longer than was initially expected. The first design concepts for the HP boxes were to make them like pachinko balls and have them fall off the screen whenever a character was damaged. However, this was later changed to the “rolling counter” HP boxes because the pachinko balls did not work so well when characters had large amounts of HP. [Infos from Wikipedia]
In the video, subtitled by the lovely Starmen crew, we can see a collection of beta scense, in which Ness has no backpack, and we can read some interesting facts about the development of the game. In the image gallery there are some unused sprites, like Everdred’s ghost, a climbing King, a Starmen Capsule, an unknow flag and a red beating heart. You can read more about these unused sprites in here. From the various concept arts that were in the MOTHER 1+2 Art Book, we can notice some nice differences from the same scenes in the final game, like a fortress on top ofDungeon Man’s head, a giant elephant that keeps up the Dalaam city, early design of Dr. Andonuts’s lab and missing snow in some areas. You can read more about these concept arts in here.
Also, some unused animations from the opening were found in the rom.