Answer : The sentences from the excerpt that seems to foreshadow Dexter’s future obsession with “possessing” Judy Jones is -
"He wanted not association with glittering things and glittering people—he wanted the glittering things themselves. Often he reached out for the best without knowing why he wanted it—and sometimes he ran up against the mysterious denials and prohibitions in which life indulges."
Where it is clearly seen that he wants all the best things that was available without the answers of why he wanted them. He always wanted best things or him.
The story is basically saying that we can learn from our elders, because they have been around longer and have more experience than us.
You can see this when it says "the tree is older than you are...you might find stories in its branches".
Comedy of Errors was a play written by William Shakespeare. It is actually the shortest play he wrote.