As for the one with Sakura, that led to a guilt trip, cause because Sai jumped the gun, again Sai, isn't all that clever, his emotions were repressed while he was in ANBU Root, so all his observations are based on inexperience.
I will skip the next one until I find it again, because I forget where the chapters are, most times, as for making him happy, it is most likely that Sakura achieving in her own chosen field makes him happy, but it doesn't mean anything romantic, remember this is coming from the same person that has rejected him over Sasuke.
and that look, how many times has Naruto said he would never joke around Sakura? before he says that he angers Sakura to the point that she hurts him, then we get that little line, he knows how to anger Sakura, just because he says I better not joke around Sakura or else she will kill me, it doesn't mean too much in a romantic light considering the fact that Naruto knows Sakura loves Sasuke.
Also Sakura is still in love with Sasuke until proven otherwise, and there is no evidence to suggest that point, before you use that fake smile thing, that happened after she happily greeted Sasuke which was 5 minutes before that fake smile, a person doesn't move on that fast, but for Naruto he has had plenty of time to move. that I will divulge a little later on.