Here's what the good fats/good carbs guide says:
Mayonnaise:
1 tbsp dairy free - good
fat free - avoid
light - limited
regular - 1 tsp is listed as good, 1 tbsp is listed as limited

Butter:
light (40% fat): very limited, no more than 1 tbsp
regular: avoid
whipped butter, light: very limited, no more than 1 tbsp
whipped butter, regular: very limited, no more than 1 tsp

Hope that helps!