Amazon EssentialsMen's 10” Lightweight Ripstop Stretch Cargo Short

What's the inseam on these shorts?

Do the pocket flaps have a different color on the underside? I looks like it's white.

Do. These have a fly?

Very confused why the prices jump all around based on size. Why is a size 32 $19 and a size 30 $34 in the same color?