I speculated and debated on the Mars pyramid face a lot and I just think that one could come up with all sorts of man-made-looking geometrics on other planets when the shadows, geography, and topography are just right (and it's my opinion you could do this almost infinitely). I think a lot of amateurs like to just instantly assume it's all stuff built by an alien (or human) race without thinking of dozens of other more likely reasons for what we're seeing.
I would start to believe in the Mars face more if there were other compelling surface images, but nothing has come up. Plus, to me, the face looks like a mountain range with the sun shining on it just the right way.
Hoagland is intelligent and I think he's been able to infuse some excellent points and observations, but he's far too much of a conspiracy theorist to take everything he says as being certain. Take for instance his dome on the moon thing, I think he's taking any sort of anomaly in an image and making a huge leap to say there's a glass dome on the moon. The noon ain't that far away and there are 1,000s of amateurs who have high-powered telescopes who look at the moon all the time and no one has come out and said there is refutable proof of a dome on the moon.
The prism and light anomalies could simply be reflections, lens flares, inferior/old quality camera equipment, etc. I just don't buy everything Hoagland is saying.