You should be fine. I have never had to limit foods, other than the day before. Won't hurt to call your GI and reassure yourself though.
I wonder why they said no mayo or butter. My GoLytely instructions do say not to have nuts or popcorn a few days before, but I've never had to do that in the past. They are even letting me have a bland breakfast the day before (toast with margarine, etc.). I'm psyched about
that. Let us know how it goes tonight and tomorrow.