Can we talk for a moment about Kuch Kuch Hota Hai?  Specifically the plot.  It's a movie that famously makes no sense when you think about it for thirty seconds, which is okay because the plot is really just a delivery vehicle for feelings.  And the biggest plot hole is the one that kicks off the entire movie - a dying Tina leaves her newborn daughter eight letters, one for each birthday, and in the last letter reveals the love triangle from her college days, and urges her eight year old daughter to reunite her father with Anjali.  It's completely ridiculous, because one year olds cannot read. 

But that particular plot point would actually be really easy to fix.  KKHH came out in 1998 - if we assume the movie timeline matches up with real life, that means little Anjali was born in 1990 (and the extended college flashback took place in the late eighties.)  And they had video cameras in 1990.  Instead of birthday letters, Tina could record eight birthday videos for her daughter.  It would make perfect sense.  It is a thing that people actually do.  And as a bonus, video is easier to show in a movie than the written word, so we could even see bits of the earlier birthday videos.

Of course, that does still leave Tina charging her eight year old daughter to manage the love lives of two adults, without considering the possibility that Anjali (or even Rahul!) might have moved on and married someone else by that point, and doesn't answer the question of why Tina went through with the wedding if she felt so strongly about Rahul and Anjali belonging together.  But those are ordinary plot holes, the kind that pop up in many movies.

Granted, there's not much you can do about the plot of a movie that's over twenty years old, but if I ever develop time travel, I'm calling Karan Johar.