I have season 1 and season 7 on dvd {the only ones available so far}. If memory serves me, then during the credits, they state that some time penalties may have been added. If it is blatant, Phil usually says something on the mat. Sometimes, we hear about it when the next leg starts.
When the "Hillbilly team" (I can say that since I have relatives that live in Kentucky) helped the one team with extra water, I would say that was against the rules - remember in season 7 when Uchenna started to help Meredith and Gretchen and then we heard that he couldn't help them because it was against the rules. We will see.
With the boats when they were in London, England.