First off: About Walter and Laura falling in love...they fall in love over the course of the summer. Notice in this lyric during that scene: "Yet the summer's drifting by/while these golden moments fly."
I agree, they should've staged it so it would be understood, but it is an entire summer in flashes.
Second off: I am still so saddened by this, one of my all-time favorite shows, closing so quickly! God bless the entire cast!
How to properly use its/it's:
Its is the possessive. It's is the contraction for it is...