Today's assumption is when error happened we try to invent new procedure or device to trap such errors in future. In this particular case i can hardly imagine what kind of further improvement may be found, and, the most important, why even we need it. There are enough predictions and crosscheks established to confirm grossweight - OFP (shows clearly 362 t TOW), loadsheet and previous experience. It was just error followed by inadequate crosscheck. Dramatic difference of 100t definitely should draw crew attention, but...
All of these were discussed above, don't see any appropriate remedial actions in general, such kind of mistakes will be done many times in future but hopefully without so severe consequences as 100t error is really very improbable.