2. There is a small hatch under the cockpit window on the right side of the civilian NGs but on the Clipper that small hatch/panel is on both sides under the cockpit.
Commonly found on P1 side of 737s converted to freighters. Something to do with getting out in case the cargo shifts. That C-40A in the picture has a cargo door, which probably explains why.
Edited to add: after bit of searching on !!!!!!!!!!!!!!, I found the following
picture of a Channex QC which also shows the small hatch under the P.1 no 2 window.
Gerard