Go to the part where Jodie goes to Cooper's ballet to surprise him. When it shows the audience, look at it carefully. Then go to the last scene in the movie when Jodie is in the red outfit. When they show the aduence, it is the exact same audenice as the one at Cooper's ballet.
It's easier to get one group of people together than two. So insted of trying to get two different audiences the director used one for the two scenes, which were probably shot back to back.