If it's a historical biopic about Wyatt Earp, did they go back in time and bring him in for a cameo? How did this happen?

Likewise, Spielberg is keeping plot details about his next movie under tight wraps. The untitled movie is described as an original event film created and helmed by the iconic director.

A crooked railway tycoon whose men are terrorising a frontier town arranges for a black sheriff to be appointed, hoping the ...