Other mistake: When Elton visits his father late in the film, his half brothers mention that there is a Rolls Royce outside. However, Elton enters a yellow cab when he is leaving the property, and then is shown in the Rolls Royce further down the road.
Suggested correction: That wasn't a yellow taxi, it was the Rolls Royce ('72 Silver Shadow).
Other mistake: After Elton get a off the phone with his mother in the phone booth, he gets into an argument with John Reid who hits him in the face on the left. In the next scene when Elton is putting on makeup before a show he is covering up the bruise on the right side of his face.
Suggested correction: The bruise is still on his left side. The viewer is looking at Elton's face in the mirror, so the viewer's left is also Elton's left.