Apparently I’m last to find out that Marty had two fiancées (yet only one love interest). Unlike Hitch’s “Vertigo”, in which the same woman plays (or actually pretends to play) two different characters throughout different moments of the film, what we have here is two different actresses playing Marty’s future wife, Jennifer.
Elisabeth Shue was cast as Jennifer, and all the closing shots of Back to the Future were re-shot for the beginning of this film. Claudia Wells (Jennifer in “Back to the Future”) was unable to reprise her role as she had stopped acting because her mother had been diagnosed with cancer. She returned to acting for the independent film Still Waters Burn.