During the play "Snow White and the Seven Dwarfs", Prince Charming is wearing a hat. When he bends down to kiss Snow White, he is no longer wearing a hat. When he arises after the kiss, he is once again wearing the hat.
Jan tells Cindy that Mrs. Whitfield was her favorite teacher, Marcia's favorite and even their mom's favorite. However, in A Fistful of Reasons (1970), Carol says that she grew up in, and presumably went to school in, Swampscott, Massachusetts, not Los Angeles.
The apple plays a big part in this story. Alice eats all the apples while practicing her role as the wicked queen, causing Mike and Sam to rush out to buy one at the last minute. However, in the play, Carol (Snow White) is clearly using a wax apple.
Obvious plastic toy gun in the policeman's holster.