About the card thing the idea of it is to identify a card that your subconscious mind couldn’t possibly know. If your extremely carefull about not seeing the other side of the card there is no way your subconscious will know what it is. About predicting it from the position in the deck that is highly unlikely if it’s shuffled well several times without looking at any of the other cards but to aviod anything like that it’s best to have a friend carefully shuffle and place the card so there is no way for you to see it. I did this one a few times which is hard but I had a friend set the card up in the next room which I didn’t access to be sure that I had no way of knowing the other side of the card. The point is I had no possible way of knowing what that card was in the physical I didn’t even see the deck which was shuffled and that’s how it should be setup.
With flying to another area you do it with a place that you couldn’t have been to where there is no question about that. If you have doubts about a place in your city go to a different city that you have never seen for sure. It’s also a good idea to try going into a public building that you have never been in then go back the next day. Anyone can find a place that they have never seen before it’s not possible for your subconscious mind to know what every place around you looks like then for it to miracuously recall the location in detail when you dream it.