Conversation so far:
Who were selected as the cast?
With the help of producers Alexandra Milchan and Robert Salerno, Schaefer cast Jared Leto as Mark David Chapman
What was Leto's role?
Schaefer cast Jared Leto as Mark David Chapman.
How long did the script for Chapter 27 take to write?
The script took Schaefer four years to write, but when it was finished, the film came together quickly.
How did Jared Leto gain his 67 pounds?
Leto gained 67 pounds by drinking microwaved pints of ice cream mixed with soy sauce and olive oil every night.
Did Jared Leto keep that weight on after the movie?
After the shooting of the film, Leto quickly went on a liquid diet.
How much weight did Jared Leto lose after the movie Chapter 27?
Jared lost 20 pounds that first 10 days.

Question: Is there anything else interesting you could tell me about the cast?
Self-contained rewrite: Is there anything else interesting you could tell me about the cast of Chapter 27 besides Jared Leto and his weight changes?