The first one is a Q400 (Brand New, and No Cabin)
The second one is a 717 (Old and with a cabin) you can only see the cabin if you look closely. The planes that have cabins visible, are the C208, CitationX, and 717.
Maybe they wanted to do like passenger flights, where you could be a passenger in live, or something? A my ideas on why this is like this?
No. That’s not true, because in cockpit view in the C208, you can see the cabin if you look back. Also in some cases when the bottom camera glitches, it moves up into the cabin, and you can definitely see that there is a cabin in there!