1: Watch the episode of the Brady Bunch where Joe Namath visits Bobby.

2: Watch at the beginning where Bobby and his friends are talking to each other and Cindy comes out.

3: When she walks out, notice that she's holding a bucket or something like that. She then looks at Bobby.

4: Then, it goes to her and she's not holding the bucket! It's a real slipup, because we would've heard her put something down and the scene switched immediately to her.