After storming the presidential palace Tanner goes alone in the tunnels and even after receiving a police SUV drives off alone. He should know not to operate alone in such situations when other options are available.
Tanner discards his helmet and hearing protection before going to the tunnel leading out of the presidential palace and possible firefight. This does not make sense.
The lead character's name (according to the end credits) is Markus Tanner, as stated by the character himself in various scenes. However, he keeps being addressed as "Max" or "Max Tanner" by other characters without any obvious reason.