Yes, India Four Two, I also noticed the anomaly regarding the location of the equator mentioned after take off from Lake Turkana bound for Kisumu.
In fact they would not have crossed the line until shortly after starting the next Kisumu-Naivasha leg, since the equator is actually about 15 miles south of Kisumu.
The black and white film sequence showing the facilities being used by the Imperial Airways 'Empire' flying boats at Kisumu set me thinking. There is a hotel there called the Imperial, which was there then, and still exists under that name. It is still recognised as the best in Kisumu, so I would not be surprised if it was occasionally used for overnight stays back then. I stayed there in 1990, and found it very comfortable - a bit of a time warp of a venue.