I had the same gripe with Kaito not seeing himself standing right next to his young son. He did turn and call his son over, how did he not notice himself standing there.
Also, I'm not sure if young Hiro turned around, but wouldn't he notice a guy who looks just like his dad standing next to him?
My other problem was with the final scene. When HRG releases Elle, she breaks hold of the restraints using her power, then turns and shoots down Claire and West. Why even wait that long, she could have broken the restraints and shocked West and HRG and avoided the whole thing. HRG knew to keep her wet when they had her trapped in the house, why not carry around a bottle of water and keep her nice and soaked until everyone was in the clear. Plus she would look hot in a wet t-shirt
I also did not like the way HRG was brought back, he was shot square in the ey at close range, so he would have died within seconds. The blood they put in the IV has to be pumped by the heart to work, I didn't see him hooked up to anything so how exactly was this blood coursing through his body and able to reconstruct his eye and brain. When this happened to Claire, she had a piece of tree branch lodged in her skull, when it was removed the brain healed itself and thus brought her back. This was a bullet that surely splattered his brain to pieces. There was nothing to remove.
I think the show would have been better off with HRG dead. As much as I like his character, the show loses its sense of "real people becoming heroes" if people are being brought back from the dead and mortal characters suddenly becoming immortal. The show will fail to evolve and move forward if this is what we going to start seeing. They will eventually run out of interesting storylines or everything will become some version of "Save the Cheerleader, Save the World". If HRG dies, yes your audience will be upset (TV mourning I guess), but they will be very interested in what happens next, can Angela possibly be killed by Adam? People do die in other ways than exploding men and super viruses.
The problem I have with the evolution of Matt's power (aside from the obvious "it makes him too dangerous" theory) is that it was absored by Peter. Sylar having Candice's power would have caused all sorts of problems with him being able to create illusions. If Peter's absorption of Matt's power will lead to him being able to plant thoughts in people and also make them "see" things, then how exactly can he ever be stopped? He is too strong a character to begin with and I think at some point he will be injected with some strain of something that will limit his power in some way, or else he will just rule the universe and we will all live to serve Peter the Almighty.
I still love the show and will watch every Monday, I just hope they don't keep getting carried away with the use and effect of these powers. It was overall a good episode by Season 2 standards, just some minor gripes.
And I agree that they should chill with all the time travelling. I hope we get some form of explanation as to why the blood of Adam/Claire can cure people when these powers are supposedly based in the Brain.