Well if you got the jacket,then you basically finished act 2(basically the whole game) .Tho if you want to replay the whole act 2,then just start from act 2(tho if you want all the stories and movies from act 1,you will have to replay to whole act 1,or just use cheats:p)
Basically do this if you want to replay the whole act 2(you can also replay act 1 that way):
Also to unlock all the stories and movies,basically do this:
Click gallery
and then click unlock all to see all the movies and stories
SPOILERS !
After you finish act 2 you can also get a frosty event(Blessing of the bells).Basically you will have to speak to a rabbit with hat(Scarllet)and ask her how can big birda (Penny)carry critters all day,after that the event should be unlocked.
Basically this:
