Was quite convenient of the writers to have ex planting a cam exactly where Babs is spiking the drink. Babs even did that behind Virat - that's some confidence there. She could've done it in the kitchen, some other place... but exactly where there is a cam... and also in a home where no one lives - so they probably bought coffee, milk, sugar perhaps on the way... (but that's a deviation).
It was quite dumb of Ammu to go to the mela without any similar plan - what was her plan? get hold of Poem and bring her in front of Virat? Could've used or planted one of her family members to take some pics if nothing else. Did the writers think about it? Most likely no, cause they wanted the mela wedding to happen the way it did and created situations that lead to it.
Happens, when story teller is focused more on the plot rather than the character. Perhaps its my bias about Ammu saying this: what they do with Virat looks more convincing than what they do with Ammu. She is dumb many times nevertheless.






Isn’t it obvious from the early days, that makers salivate to separate leads when they are together and force them together when they are separate?