I think you're just trying to read too much into certain things. Michael saying "Marry me!" is not supposed to be any kind of foreshadowing. It's just supposed to be funny.
Well, that's what I mean. What clues are clues and what are just meant to be funny? I don't actually think the writers decided that in advance, they just winged it largely. Of course, now that they've got more episodes, there's no telling what previously ignored clues could turn out to be important after all.