Corrected entry: The entire last fight scene broke the physics set up by the entire movie. The inverted team should have been inverted after the battle and then shifted back through time to assist in the battle, being picked up by the regular team's choppers. Instead, they all started at the same time and simply appeared to be going backwards.
Corrected entry: Kat isn't wearing an oxygen mask in the inverted car scene, so she should have suffocated and died.
Correction: At the time of this event, Kat has not been inverted yet, therefore she doesn't need an oxygen mask.
The car is seemingly an inverted one, driving from the future back in time to the point when/where the non-inverted Kat is put in it, so it makes sense that she wears no mask. The real error in that scene is that the car has no driver (unless we assume it has superpowered self-driving capabilities, which I wouldn't assume). Even if you can put someone non-inverted in the inverted car, while driving in any direction in time, it needs to have a driver.
There is a driver. You see the driver switching cars along with Sator to Mercedes' from Audi where they were with Kat.
Corrected entry: When the guys walk in through the restaurant kitchen to beat the protagonist it is full of working staff, later when Kat leaves and he goes in the kitchen for the fight, the staff is suddenly gone. (00:32:02 - 00:32:28)
Correction: There was plenty of time for bad guys to ask the staff to leave the kitchen before Protagonist walks in.
Correction: The inverted team was not leaving with Red team. They had already returned for 10 minutes by the time Red team's countdown starts. It's just shown that way (leaving with Red) in the movie for cinematic effects and suspense.