1) if I recall correctly – not all ingredients need to be printed on the label – I think if it is less than 2% it does not need to be included.
2) years ago when Nabisco started printing on the boxes 100% vegetable shortening I had the opportunity to discuss this with a person who worked in the baking division. I was selling suits at the time and we were talking as he was trying on and being fitted. I asked him about the 100% vegetable shortening and he told me not to believe it. His reason was that if he finished a run that was not 100$ vegetable shortening ie. it was lard, they would not empty and clean the vat with from the lard – rather they would just add vegetable shortening to the vat.