Lilly and Kenny
Okay, I'm not sure if anybody has said this before but If they did, I am going to say it again.
Many people think that it is only possible to side with either Kenny or Lilly in Season 1. However, it is possible to be friends with both of them and have Kenny come with you no matter what to help find Clementine at the end of the game. So, I'm not completely sure what choices you have to make in order for Kenny to come with you, but these are the choices that somebody I know made and he managed to get both Lilly and Kenny to like him. Also, I think it will be important to like both Kenny and Lilly because we know that Ken comes back in episode 2 of Season 2 and it is thought that Lilly will be reappearing in the last episode of Season 2: No Going Back.
Sided with Lilly at the Drugstore and didn't hurt Larry
Killed Ben at the bell tower
Stole from the Stranger's car
Tried to save Larry in the meat locker
Saved Duck at Hershel's farm
Shot Beatrice when trying to salvage supplies from the Drugstore
Fed Kenny and his son with food in episode 2.
Gave Duck water and food when he was about to turn
Agreed with Kenny about his plan of a boat
Fed Duck in the Drugstore, episode 1.
I'm not sure if there are any other ones that I have missed but basically, all you have to do is help revive Larry and then Lilly will shoot the brothers in Ep 2. Then, after that, agree with Kenny on stealing from the car and kill Ben. Also, remember to help Ken's family and feed Duck with water, animal crackers and energy bars when given the chance. Feeding Duck and Kenny at the Motel will also boost Kenny's opinion of you. Agree with him about the boat also and he will become more fond of you.