The movie sends at least three reminder, it is not about logic when it is magic. My mind, which ironically worked a little too hard to let go of logic, could only see the makers attempt at providing logic where none was expected.
It is indeed a fair attempt in trying to build a story around ghosts. Unsurprisingly though, it neither makes you laugh nor appreciate the effort. In fact, the writing is often repetitive as the ghost demonstrates its existence or when scenes over-explain.
The film even throws in a couple of social messages- anti-superstition statesments are well pronounced and there is even a flippant, educate your girl child line. I didnt know if I should laugh or cry at this least one.
I watched Golmaal Again in a single screen theatre and there were huge parts of the film where the audience was watching and listening attentively too! I am not sure though if that is a good thing for the film.