I started listening to the Empire podcast interview with Christopher McQuarrie re. MI - Fallout, who is a terrific interviewee -- witty and fun and full of great anecdotes. It's over 2 hours long and only the first part (!), but within the first 30 mins, there have already been some super juicy bits: [link]
I long considered the plots to be secondary in this franchise, but I had no idea just how secondary. For example, the big climactic helicopter chase in Kashmir ? Totally started ass-backward. To wit, Tom Cruise long wanted to try a big stunt like that, and the thing he was trying to do was so crazy that the ONLY country that would let him do the stunt was New Zealand. So they decided to film it there, except New Zealand is not a site for a global conflict. So they reverse-searched for a likely place whose scenery resembled New Zealand and came up with Kashmir. Once they decided that was the location, they had to devise a plot to get everyone over there.
This seems a CRAZYPANTS way of making a $200 million+ budget film but apparently it all worked out? Also, McQuarrie said he lucked out when Tom Cruise broke his ankle and forced the production into a 6-week break, which gave him the chance to edit the footage they had and come up with a better way of moving the story forward and strengthening the team dynamic.