First of all
to The Beach.
It is very important to read the book if you are to understand this plan and the principles behind it. The food list has been revised since the book came out but there is a list of the allowed foods for Phase I in our Frequently Asked Question Section. Your food questions are answered there. Wasabi is OK although it's not listed. Note the serving size for soy sauce.
Yes, sugar is a no-no so the rub may have caused you a problem. Salt is another baddy so be careful of it and there was probably lots of it in the rub. Note the serving size for soy sauce.
Caffeine does affect some folks but go ahead and have it but limit yourself to two cups. Diet sodas are OK in moderation - just be sure you drink lots of water. The theme behind this plan is to eat UNPROCESSED foods as much as possible.
I hope this helps a bit. There is lots of support and information on this site. Join in the daily or the Phase I chat threads.