Factual error: The animators have clearly tried to make all the writing in the film look Arabic. However in one scene we see the faces of Jafar and the Sultan as they read a scroll. Their eyes move from left to right; Arabic is read right to left.
Factual error: During the big Newsies rally when Medda is singing "High Times", as she is swinging, lighted exit signs can be seen. I don't believe that those were around in 1899.