As the saying goes "far better to keep your mouth shut and let them think you are a fool rather than open it and let them know for sure". I think the worse thing is hearing pilots trying to explain away errors when all they do is to dig a deeper hole for themselves! Just about everyone screws up on their flight tests, I know I have on every one and usually just comment "oops". Either the instructor examiner didn't think it was a serious enough mistake up or was too scared to fly with me again because I have passed every check ride at first attempt so far and I'm certainly no "top gun" pilot.