Got these pics from another forum. It shows how just 1cm of floor mat movement could mean a difference to safety. These are from a Lexus.

The defect also probably lies with the way the accelerator pedal travels. The pedal geometry allows it to go down too much towards the floor and practically touching it. Given the right conditions, it is possible that even the coarse fabric of a 3M floor mat could still potentially trap the accelerator pedal.

Toyota/Lexus should either design a shorter accelerator pedal or change its geometry such that it is still about one or two inches away from the floor when the pedal is at its lowest position.