We know that Phil was stuck in Groundhog Day for many, many years, by his own reckoning, and that he was fully aware of it throughout his ordeal. But it seems that everyone else was blissfully ignorant of Phil's predicament, and had no idea that anything was amiss. For example, when Phil spends a day with Rita, and somehow manages to woo her, she falls asleep still wooed, but wakes up the next morning with no recollection of the wooing.
This seems to suggest the troubling prospect that the entire world has been unwittingly sucked into the same time loop as Phil, and that they are all completely unaware that anything unusual is happening. The same person is being born again and again, and no one notices. The same person is dying again and again, and no one notices.
Is this really what the writer, director, and producers had in mind? Is the entire world stuck in Phil's time loop?