The "Combat Reflexes and Additional Attacks of Opportunity" section is basically unchanged from 3.5.
If one action = one opportunity then in 3.5 a person could full attack with a bow and only provoke once. That isn't the way I have seen it played. You provoked for each ranged attack back in 3.5 and you still provoke for each ranged attack in PF.
The "Ranged Touch Spells in Combat" section on page 186 did not exist in it's current format in 3.5.
Back in 3.5 it was not explicitly spelled out that Ranged Touch attacks provoke or do not provoke. However, ranged attacks did provoke and so I am *guessing* that there was a question as to whether ranged touch attacks provoked or not. The new section in Pathfinder answers the question.
My guess here is that people conflate the restriction on multiple opportunities during movement with the rest of the rule. Ie: the rule against multiple AoOs during movement gets boiled down to 'you only provoke once (per creature) when moving' which then gets conflated to 'you only provoke once (pre creature) per action'. Not an unreasonable chain of thought, but not one supported by the rules.