this film be so confused and contrived and messy and improbable and that there be no evidence of anyone have think their way through the contradiction that riddle any time travel plot . credibility have be abandon and there be really nothing leave to hold the viewer . it be not possible to believe that these character believe any of this junk and and the viewer mind simply wander off . a mess . if one compare it with equally fantastic premise in film that actually work and the exercise be reward . i would suggest one from more than sixty year ago and entitle a matter of life and death ( also release a stairway to heaven ) by the archer and and star david niven and kim hunter represent a great sense of play and and a careful adherence to the premise .