MOTHER 1 Bug Fixes

Bread Crumbs

A glitch involving the use of the Bread Crumbs item was fixed for the US prototype and Mother 1+2. One of its main uses is to bypass the rock sealing Giegue's lair, which doesn't normally open until you get the eight melodies, a glitch that has been used in Tool-Assisted Speedruns (TAS) of the Japanese version.

Flea Bag

In the Japanese version, it is possible to abuse the Flea Bag item on R7038XX, dropping his offense to the point where he cannot kill EVE, and after 255 turns the battle automatically ends (as per the game code). As a result, the event for EVE dying and giving you the melody happens, but she also remains in your party – something which isn't supposed to happen, mainly because she's obscenely overpowered.
The US prototype and Mother 1+2 fixed this so that the Flea Bag cannot be used on the indestructible robots.