Sunflowers are featured often within the movie, usually in connection with Joseph's mother, Rachel. However, sunflowers are native to the Americas, and did not grow elsewhere until European explorers brought seeds back with them during the 16th century.
In the Beginning of the song More then you take, there's a close up of Joseph's head and shoulders. His headdress is being his shoulders while his arms and shoulders are white. When he Stands up the headdress is on his shoulders and his arms and shoulders went to his regular skin color.
Multiple differences between the movie and its original source material. Changes made when another medium is adapted into a movie are, by policy, not considered goofs. The movie even begins with a disclaimer that "artistic and historical license have been taken".