While waiting for the man with the yellow hat to buy train tickets, Curious George causes trouble by mixing up numbers on the schedule, but he makes up for it when a little boy's toy rolls toward the tracks.
Notes the difference between monkeys and apes by describing what they eat, how they communicate and show friendship, how they have babies, who their enemies are, and other aspects of their behavior.
Describes the physical characteristics and habits of different kinds of New World Monkeys, including owl monkeys, squirrel monkeys, Capuchins, and spider monkeys.
George the curious monkey creates chaos when he tries to take all four of his neighbor's pets for a walk, especially since they are a dog, cat, canary, and goldfish.