The Last Jedi novelization recently came out and has gone a long way in filling in some of the gaps that Star Wars fans wish was included in the movie.
Rian Johnson was, understandably, pretty excited to get the gig to write and direct The Last Jedi and now his cameo in the movie has finally been revealed.
Some fans have griped that you need supplemental material to fully grasp The Last Jedi, but Star Wars has always been that way.
Even fans who have seen The Last Jedi in the theater more than once would not have picked up on this cameo.