CharlesYang’s review published on Letterboxd:
I don't how. I don't know why.
Hell even the writers themselves don't know.
But my bet is that Andie MacDowell (who plays Rita) is a witch who was powerful enough to put this time loop hex on Bill Murray so that he, through hardship and self reflection would one day transform himself into her ideal man.
Thus the loop only ends when all her wishes were fulfilled.
What do you think?
Is this shit crazy?
That's the closest I can get without going into a 5 hour tirade on temporal causalities and quantum pseudoscience, supernatural phenomena etc. etc. etc.