From Muppet Wiki

• Folk singer Theodore Bikel visits Sesame Street, and sings for the neighborhood residents.

• Bill Cosby plays twins who count to twenty.

• Ernie and Bert: Bert is reading a book when Ernie startles him by asking if he wants to play checkers. Bert says, "I thought maybe you weren't here!" Ernie starts to search to see if he can find himself.

• Story: Bob tells the story, "The Most Beautiful Woman in the World." When a little boy can't find his mother, a village of Anything Muppets ask the boy what she looks like. He replies that she's the most beautiful woman in the world, but the boy rejects all of the beautiful women the village can find. When the boy finds his mother, it is revealed that she is a frail, gray-haired woman -- but in the boy's eyes, she is beautiful.

• Cartoon: "Imagination O" -- A surreal story about a boy, a goat, and a bulldozer that closes up a hole in a cloud that blows the cold. (First: Episode 0011)

• Speech Balloon: "O" -- Open (First: Episode 0014)

• Cartoon: A man carrying a large "O" in a wheelbarrow recites an "O" limerick with the help of a smaller man. (EKA: Episode 0198)

• In a four-part sketch, Cookie Monster and Ernie demonstrate a short and a long time when Cookie Monster needs to borrow Ernie's phone. (First: Episode 0064)

• Film: A child watches a building "grow", step by step, from a hole in the ground to the roof. (EKA: Episode 0184)

• Sesame Street Animal Films: Pigs (EKA: Episode 0179)

• Gordon and Tom cooperate to build a block tower. (EKA: Episode 0262)