While appearing on the Jimmy Fallon Show, Mark Ruffalo “spoiled” the title and the ending. Although, it was bleeped out. Mark Ruffalo revealed the title of the film. It is funny as he is talking about it, he leaps over the chair in the studio. The Last Avenger is what he said the title was.
The trailer itself could have been darker, and it should not have revealed as much dialogue. There is also a scene in which Thanos’s back is facing away from the camera, which seems irrelevant. There should be less revealed in a short movie trailer.