MyFitnessPal's response to my "Fats" question, which explains totally!
"Thank you for taking the time to contact us. Our apologies for any confusion with how Fat is tracked within the program. The Total Fat column represents the total of "Total Fat" as a category, but not necessarily the total of all the sub categories of fat.
The reason is that it is not mandatory that food nutritional labels include the break down of fat in the sub categories. However, if the information has been provided we will then show it in the sub categories.
As for the Saturated Fat, this is also still a sub category of the total fat, with a limit. The goal is actually meant to be a limit. Unfortunately, there's not a very tidy way to make this evident, given the screen real estate available to apps, and our desire to keep the nutrition table neatly organized.
Our recommendation is that folks should not surpass the total fat goal in grams, and their intake of saturated fat (definitely the least healthy!) should not be more than a portion of that intake. This is why we put a "goal" on Saturated fat, and leave the other sub-categories without a goal. If users stay within (or under) the saturated fat goal, then the rest of their fat intake will naturally be from the more healthful options of mono or poly unsaturated fats.
So in summary the best way to look at the Fat category is that you should try not to surpass your "Total Fat", and while trying not to surpass that total, out of that number your Saturated Fat should not be more than the recommended amount."