She'hakol may theoretically apply to many foods, b'diavad,--even bread, wine, the Five Special Fruits, and mezonot. However, we have a principle to say the highest-level food blessing possible. If you said she'hakol, mistakenly believing it was the correct blessing for a higher-level food, she'hakol does cover the food after the fact and, b'di'avad, you may eat the bread, wine, or other higher-level food.