Full House

Mary-Kate Olsen and Ashley Olsen were chosen for the part of Michelle because they were the only twin babies that didn't cry at the audition.

According to the show's website, John Stamos, Dave Coulier and Jodie Sweetin are the only cast members to appear in all 193 episodes (including unaired pilot, which is the episode that excludes Bob Saget, who otherwise is in the remaining episode) of the series.

Mary-Kate Olsen is left-handed and Ashley Olsen is right-handed. That is why throughout the show, Michelle uses both of her hands to write and eat.