As you play through the game, Isabelle will ask you to design various facilities for the Town Square. After you build all of them, the Credits will run. After you re-enter the game after the Credits you can view them at any time by sitting on the bench in front of the fountain and school. On your bottom screen, pictures of all of the characters and facilities you had helped/build will cycle trough. Note: you can't skip the Credits as they run; even if you already watched them.