Easy ways to fix plot holes

Rating: 9/10 (15 January 2019)

I'm not bragging, but I really should go in to being a consultant for scifi movies. There are so many great films that could have been even better if they'd taken a few minutes to address issues that will drive some viewers crazy. For example:
The expedition is entering an area where no one has returned completely unharmed. They should have gone in to the shimmer with sporty hazmat suits with thin cables attached so they could be extracted or find their way out if need be. The director may have felt that hazmat suits would interfere with the character's interactions etc, but when they wake up in the tents not understanding what has happened, they could be out of their suits with no sign of the cables attached at that point and carry on.
It would have been easy for the biologist to put on gloves when gathering specimens.
1 minute of dialogue where they argue about taking little boats on croc infested waters (like "there's no other way to get there) and nervous glances while in the boat.
There is no reason the one pulling guard duty wasn't in the lockout tower with the others. If the base needed a lookout tower, they could have made it inaccessible to justify them being on ground level when the bear attacks.
Those were the most glaring issues I had, everything else could have been forgiven. I give this movie 9 stars Because I watched it on my TV at home, and I didn't find myself picking up my phone to play solitaire one time.
The movie was beautiful, creepy, sounded great, and kept me engaged through to the end. It had me thinking about it all the next day off and on, so that I came home the next night and watched it again. This time I tried to ignore the plot holes, and just focus on the atmospheric qualities of the film, and I enjoyed it even more.
Now about the ending, I think Kane was probably the clone of her husband. I think Lena was still the original Lena, only she was profoundly changed and still had the glimmer effect in her DNA. At least it was realistic that they were being kept in quarantine. If the ones in hazmat suits tested their blood, organs, etc they would probably find evidence of the alien in their systems and not let them out into the general public.
I was confused as to why the Lena clone decided to burn everything...was it because that's what Lena 1 wanted, and they were essentially the same?
Anyway, with all the crap out there, those giving this 1 or 2 stars are being pretty harsh considering the scope and beauty of this film. With a few simple tweaks, it could have been a masterpiece!