jswert123 said:

in reading this...i made some thoughts...in Part 1...remove any "visual" sign of jennifer......theres still mention of her when Marty's sister sais "jennifer parker called" leave movie intact up till point where marty gets keys from biff and opens garage door..then jennifer (elisabeth shue) walks up and bout that time doc brown shows up they fly off into the sky and...cut away part 2 credits and then cut to the flying thru traffic in the air and landing.....and continue from there..that solves to me the jennifer switcheroo

Can't do it. Part of the set-up in the beginning of the film is when the woman with the "Save The Clock Tower" flyer interrupts Marty and Jennifer about to kiss. That's the whole key to how Doc comes up with the grand finale - because Marty had the flyer in his pocket. Without the Jennifer scene, where did Marty get this flyer from?