In "Kow Tow We Won't Bow," Nat called a "redbird" to help the Smurflings cross the river. However, this "redbird" is called a scarlet tanager, a bird species only found in North America, not Europe (which is the setting of the Smurfs cartoon series). It should have not appeared at all.
In "Kow Tow We Won't Bow," Smurfette introduced to the Smurflings several flowers in the forest including a tiger lily. However, tiger lilies were unknown in Europe until they were imported from Asia in the 17th-18th century. The background of the Smurf cartoon series is the late Middle Ages (circa 14th-15th century), early for the understanding and cultivation of tiger lilies in Europe.
In "Kow Tow We Won't Bow," Smurfette introduced to the Smurflings several flowers in the forest including a jack-in-the-pulpit. However, jack-in-the-pulpits were unknown in Europe until they were imported from North America in the 17th century. The background of the Smurf cartoon series is the late Middle Ages (circa 14th-15th century), early for the understanding and cultivation of jack-in-the-pulpits in Europe.