How does the author use foreshadowing in The Chrysanthemums?

The tinker's confusion when Elisa reminds him to keep the chrysanthemums in sand as he's driving away, his quick change of tone when he notes that the flowers have a nasty smell and she disagrees, and the laughter that leaves his eyes as soon as he stops speaking, all foreshadow his deception. When he ultimately dumps the chrysanthemums by the side of the road, the reader should not be very surprised by this, given the hints that Steinbeck has left throughout the story as to his true manipulative character.