If the race uses detailed tasks in which the order could be easily switched, then it seems to some not to be very photogenic. If the race uses tasks that have great scenery, then it seems to some not to be as competitive. I imagine it's hard to put together episodes that have both aspects every time. I personally loved the scenery of this episode.
To me, the detour was a choice between something that could be finished quicker but took some guts or one that didn't take such fortitude but might take longer.
For the roadblock, the order could be switched because the teammates waiting at the bottom soon realized they couldn't count on who was flying in.
I also liked the fact that we didn't know whether Erin or Ashley was flying in when we knew they were the last. Instead, we only saw the successful take-off afterwards.