What are some foreshadowing and flashback moments?

In Chapter 1 when Pony is jumped by the Socs on his way
home from the movies, they ask him if he wants his hair cut off.  He will later get his
hair cut off because of a Soc (because he is there when Johnny kills Bob
Sheldon).

In Chapter 2, much of the second half of the
chapter is a flashback.  It is the part where Pony flashes back to what happened when
Johnny was beaten so badly by Bob and the other Socs.

Then
at the end of Chapter 2, the very last line could be called foreshadowing
too.