The Flash Ending & Post Credit Shocker Revealed
More in-depth breakdowns of both the final scene and the post-credits sequence of The Flash have found their way online (from @CanWeGetToast), and they reveal details of one particular cameo that was thought to be a joke for a considerable amount of time!
SPOILERS PAST THIS POINT
According to previous rumors, George Clooney's portrayal of Bruce Wayne supposedly makes an appearance at the very end of the movie. The context of the timeline is a little unclear, but it seems like Barry Allen gets trapped in his reality as he says "you're not Batman" to the stunned hero. The hero then looks around to make sure nobody has heard The Flash reveal his big secret.