I for one think the only hole that needs patching in TLJ is Holdo. There is a clearly ADR dialog spoken when she says “I’ve dealt with plenty of trigger happy flyboys like you.”
The idea would be to replace that with something like “But there could be a First Order informant on board.”
So the whole thing would go as follows: “Of course you do. I understand. But there could be a First Order informant on board. You’re impulsive, dangerous, and the last thing we need right now. So stick to your post, and follow your orders.”
I do agree with this or atleasy something like this. That holdo is the main thing that needs fixing left in TLJ, though that may be for another edit like Hal said.