Corrected entry: When Oberon meets Titania for the first time in the 'I'll meet by moonlight' scene, he is wearing a golden crown. After some time, when he lies on the ground with Puck beside him, the crown disappears.
Corrected entry: At the beginning of the fox hunting scene, there is a lady (I don't remember her name) riding a black horse. When she is shown again her horse is white.
Correction: The lady riding the black horse is not meant to be Hippolyta, you can tell this by the style of the hat she is wearing and the front of her dress. Also, Hippolyta is riding with Theseus and not by herself.
Correction: He's a fairy and throughout the movie their clothing, surrounding, and even their size change by magic. He magically removed the crown.