Let's see if we can uncover all possible preview scenes displayed.
It looks like there are 3 decisions that affect the preview
I'll edit this later as more is learned.
1) (saved Doug) Doug: "you look like crap lee, when was the last time you ate?" (offers energy bar) "keep it" "hey I owe you a lot more than a half eaten candy bar"
2) (saved Carly) Carly: "I want you to have this, okay? In case you or Clementine starts feeling weak."
Clem says she's really hungry. Kenny says we gotta get food soon. "Howdy! I'm Andrew Saint John. We're from the St. John Dairy". Guessing not dependent on choices.
1) (tried to save Sean) Katja: "Don't repeat what happened with the walkers at Hershel's farm." "You choose the kids this time."
2) (tried to save Duck) Katja: "I never did thank you for saving Duck from the walkers back at Hershel's farm"
Kenny: "Something's coming Lee, there's gonna be a war." Lee: "The walker's don't worry me as much as the bandits" Bandits: "You fucked with us, now we'll take what we want" "there's too many of them!" (man in glasses shot with arrow)
1) Sided with Kenny: Lilly: "You've never liked my dad. Even back at the drugstore when everyone thought Kenny's kid was bit, you went out of your way to side against him."
2) Sided with Larry: ???
3) silent/passive : No Lilly speech. Kenny & Larry argue how to handle newly infected person
Young man in high school athletic jersey firing scoped rifle amongst zombies "This isn't happening". "No more please, no more!" (Lee hits him with axe?)
I always chose to go at night so I might have missed any preview material dealing with Chet