Well, let's start with saying - "thappad bass itnisi baat?". The thought that yes you can't file a divorse only because of a thappad when you have a very lovely family, a well earning man of the house and now the couple is about to settle in London, might seem to be unreasonable at first but slowly you realise that isn't only a thappad.
Summarizing all the interviews, and the movie, let me talk about the message.
The thought that "thappad is also a form of love", when your parents can slap you and there is no doubt that there is any relationship as pure as a parent child relationship, maybe yes a slap isn't a very big deal. But, I prefer having the analogy with the relationship between siblings. They too, end up in fights many a times like any other siblings. But the question is there isn't a rule of the game that only one has the right to hit the other and that the other should always move on. A justified fight among siblings is when they both end up reconciling together and each genuinely finding his/her mistake. The question that thappad raises is not how can he slap his wife, it's about how can he not realise that he was at a fault and that he had commited some grievous mistake.
Talking about the cast and direction,
All characters played very well. The direction was outstanding and so are the simple yet impactful dialogues.