After the cast list in the credits, the movie shows the girls walking past a staircase. A teacher is walking down and drops a whole pile of papers and the papers spread all over the staircase. A group of male teachers come by and they bend down to help. When they bend down, you see different patterned thongs.
A little bit into the credits and there's a scene in Tokyo, Japan. There are three girls out by a fountain looking at their cell phones. Of course, the picture on the cell phone screen in John Tucker in thong.