Question: Why does Doc send Marty back to September 2nd? Doc gets shot on the 7th, so this is a very short timetable to work with.
zendaddy621
8th Oct 2020
Back to the Future Part III (1990)
7th Feb 2020
Back to the Future Part III (1990)
Question: When towing the car across the desert, why did Marty keep checking the speedometer? Did he really expect a horse to gallop at 88MPH?
Answer: At that point in the film, Doc and Marty were looking for any possible means to move the DeLorean regardless of how fast it could actually go; while using horses may have been an unlikely option, Doc and Marty were just grasping at straws at that point and were willing to try anything.
But then Doc says that even the fastest horse in the world could only run at 35 mph so why even try it.
Answer: They were using the horses to get the DeLorean from the cave to the town. Why not test the speedo at the same time?
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Answer: The letter that Marty received in 1955 was dated September 1st, 1885; sending Marty back any earlier than that date could potentially cause a time paradox, which was something Doc took great care to avoid throughout the majority of the film trilogy.
zendaddy621
Marty can go back anytime in the 8 months and tell Doc that he will be murdered and to send a letter that was dated September 1st.