In Episode #19, after the failure of both Rei and the dummy plug to synch with Unit-01, Gendou stands up and asks Fuyutsuki to take command. Gendou now presumably leaves for the Eva Hanger, where he later meets Shinji. This happens at about 13:40.

All well and good, except that shortly after this, during Rei's kamakazi attack with the N^2 mine, Gendou is again seen in the command centre. This happens at about 15:00


And in case you're skeptical, yes, Gendou is again see in the command centre at about 15:18. Seated I might add.

Gendou is finally seen in the belfry of the Eva hanger ar 16:16.
This all seems to raise the slight question of why Gendou decided to leave, then hung around and sat back down on his chair for a while before heading to the hanger. While not a monumental issue in the scheme of things, it is nonetheless an inconsistency in the choreography of the episode.
In situations like this, we must turn to time honoured teachings for answers....

You know the drill.