On a narrative level, the game has many bugs.
I've only recently played this game, going crazy trying to complete all the courses and unlock the various scenes.
You are right, but Paul's case is not the only one (to get the first time in the elevator you don't have to service Ian in the taxi and leave his path open to call him back later) and there are several other times where paths are mentioned that you are not on.
Many endings overlap as well:
in one, Jimmy ends up arrested and in the next scene we see him taking Mark hostage and threatening Jennifer.
in another, Mark and Jennifer argue and break up, but then in the next scene, he's at home talking about Jimmy's photo and deciding what to do (with the love or death ending)
It's a shame for these little imperfections because the game is fantastic and Jennifer is wonderful!