Raw potato as long as its not green is actually fine. Its not really a beneficial food stuff as its so starchy but its not toxic either. Green potato is the issue and the one that needs to be avoided at feeding
And yes the raw nuts is just for peanuts (and actually pretty much all dried beans / legumes apart from peas and mung beans) due to the amount of antinutrients they contain.
Theres actually a lot of myths out there, and a lot of things that are misunderstood or exaggerated. For instance the fact mould on blue cheese is toxic and going to kill them if they eat it. I recently did a trawl of the scientific papers involved and discovered that the rats would need to eat over 11g of the worst kind of blue cheese in order to have any effect on the body, more in order to cause injury / illness. Whilst its still not something you want to feed its not well communicated or understood. Another good example is Garlic, its a super food, great for the heart, immune system (when fed raw) and a natural antiparasitic, yet its also toxic in large amounts (its a member of the bulb family after all like daffodils). Feed a small amount in this case and its beneficial (around 1-2 raw cloves per rat per week-month, they can tolerate more cooked but its not as beneficial), feed too much and its bad.