The Simpsons Game (X360) - Position Storage with Re-enabling Autosave 

still not applicable to ps3, it's x360 only. Anyway you need to have the game saved on a removeable drive and when you're in springfield do the position storage setup and right before you go into the warp you remove the drive. this will trigger the save failed screen and will let you save again once the drive is put back in. this will be useful incase we need to do anything with the position storage save corruption and messing with level progression at any point in the future, so we get timesave from earlier levels having the ps warps still and having autosave to corrupt the files still