When Peter and Jan rode their bikes home, Jan had no bow on her barrette. When they ran inside to tell the news, Jan had a red bow on.
Marcia, due to her bad behavior, is removed from the role of Juliet in the play and is replaced by her understudy, Tina. Then, the girl who was to play Lady Capulet (Juliet's mother) comes down with the mumps and the role is given to a very contrite Marcia, who on hearing about this, asks to be given another chance in the play, saying this time she will not cause any trouble. The role should have been given to Lady Capulet's understudy.
When Jan, Cindy, Greg and Bobby are watching Marcia and Harold rehearse their lives, Marcia becomes more impatient and demanding to all of them. As she closes the family room window's drapes, Greg's and Bobby's hands are seen coming from outside, closing the inside drapes as well. This shows that there is no glass in the window.