I decided to mess around with Background Storage a bit and decided to compile a list of all the findings.
-Waiting for the 'Hero Legend' cutscene to play on the title screen results in a glitched cutscene. The ToH background will be behind the pictures.
-Opening a file and starting a new game will have the ToH background during the opening cutscene.
-After a while of sitting on the File Select screen, the bottom screen will suddenly go glitched and the game will crash.
-Gameplay becomes a bit choppy.
-Opening Gear or Items causes the game to crash.
-Opening a menu has different oddities depending on where they are opened. Some spots make both top and bottom screens go black with multi-coloured pixels. Some spots open the menu for a second but then crash (music still plays). Others will allow the menu to be opened, but when it is closed the game crashes. Some spots can also make it crash and glitch only the bottom screen with a bunch of crazy pixels.
-Going through a portal causes the game to crash once you get close to coming out the other side.
-Performing BS and returning to ToH produces a few things. 1F crashes normally when opening menus. On 2F you can open menus, but then closing them makes the bottom screen glitch and the game will crash. Going to 3F will cancel the Background Storage.
-Have your game crash and then start it up again. If you then Bombrod again in ToH up to 5F/and above and then fall, when the screen starts moving back to 3F, it will be more glitched. It also does this if you cancel a BS and do it again while in ToH.