Okay I might be completely off. But I think the dialouges dev said to sonakshi right after " pati mangalsutra subh" etc in shudh hindi was imporvised by shaheer.
imo he looked like he was liking doing that part and that part didn't feel like a part of the rest of the dialouge. all other dialouges are super dramatic and tv serial type and this specifically for 1-2 minutes looked v charming.
also to add to my theory. erica's next dialouge had absolutely nothing to do with those specific dialouges just before. it was not a reply to it just to the pati wala part. so yeah
what do you think? i think it was improvised.