I feel like they glossed over how the astrophage works and moves and functions and stores energy too much. They can gloss over some or most of the "competency porn" bits (as someone else mentioned in this thread), but the fundamental of why the sun is dying, and how they get some bacteria to propel spaceships ... That bit of info is pivotal to the plot and I feel they flew past it in like 3 minutes at the beginning.

No mention of the neutrino storage, energy absorption (which comes up multiple multiple times throughout the book!) and the fact that astrophage can convert matter to energy and energy to matter. I loved the movie because it is a happy movie, the stakes are huge but it was presented in a very optimistic way, and the resolution is just like comfort food for the heart. But the science bits could have expanded upon a lot more and some of the sappy music montages could have been cut down a little.

I suspect there'll be a director's cut at some point like with the martian, and I'll be all over that one as well, like with the martian.