*No chemistry between Kat and Protagonist. Why is she so important to save? More important than saving the world?
*Final fight scene was strange and cool. No extra cash for bad guy actors? It was more about blowing things up / inverting things back than an actual fight scene. Still cool.
*Chemistry between Neil and Protagonist was very good.
*My two take aways from the sailboating scene - The word Opera and Kat willing to kill Sator. (Why did the kill switch not work here?)
*Typical time travel issues: Why does Neil go back to save Protagonist in the Opera house? If Neil did not show up, would Protagonist die? How would Neil know to go back if Protagonist dies? Why does Neil not take the algorithm piece and call it good there? Why does Neil need to die at the end to save Protagonist? How would he know to go back when failure means end of world?

Still liked it a lot however Nolan made some strange choices with the sound mixing and the plot could have been stronger.