Organs found inside the body cavity like the gall bladder are glands, they come out when you gut the critter. The little lumps of tissue you find between the skin and muscle are lymph knodes. I don't ever remove them and they don't affect the quality of the meat. If you see them when you skin, they are worth taking a look at, because sickness often causes changes in the lymph knodes. If I saw unusual lymph knodes in an animal, I would probably throw it away, but I can't say as I ever have.