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Some say the flag height compared to the horizon shouldn't alter much against the horizon, but it does. How come? A child can answer this one...

 flag height

One picture was taken closer to the flag than the other; that was tricky wasn’t it? The viewing angle has changed. 

There is a secondary answer to other images in case they don’t understand the first. The surface of the moon wasn’t smooth as a snooker table; it’s a little uneven to say the least. Do observe the next image of a crater that Neil almost landed in. If Neil stepped down into it then all angles to the flag or anything else will change, and the same to walking up a slope. Where is the mystery now?