I was playing Max Payne 3 and I noticed some oddities in the graphics, some of which can be seen http://imgur.com/a/IBsM8, in addition to these there was a few parts where I noticed the ground was missing. When I restarted the game, it was fixed, should I be worried?
No, glitches can happen!
Normally when a card is dying it makes odd lines and stuff on the screen and it's really noticable and i did not see anything wrong in the photos so i would be suprised if your card was dead! It was odd finding a thread that said "Is my graphics car dying?" at least you spelled it right cause ive seen people say gra fix card.
I cannot see any missing textures from them pictures.
Is the weapon supposed to be golden?
Yes, the weapon is supposed to be golden, I should have mentioned that, and yeah, nothing missing, just the giant black wall that wasn't supposed to be there and the extension on that wall over the corridor.