18
votes
2answers
8k views

Back to the Future Part 3 - Why doesn't Marty use the other DeLorean?

In Back to the Future Part 3 Marty follows Doc back to 1885 to rescue him from being shot at the hands of Buford 'Mad Dog' Tannen. He arrives in 1885 some time after Doc has written the letter that ...
10
votes
4answers
811 views

Looper: Why don't more things change back?

In looper why don't more things change when they kill/mame people? Like when Joe shoots himself at the end and Older Joe disappears why doesn't it undo the things that Older Joe did seeings as he now ...
3
votes
1answer
267 views

Time travel paradox in Futurama

In S7E3 "Decision 3012", a man from the future travels back in time to stop Nixon winning the election. Since he defeats Nixon, there is no need for him to return to his own time. He never does and ...
28
votes
7answers
4k views

In Back to the Future Part II, how could old Biff have made it back to 2015?

So in Back to the Future Part II, Doc picks up Marty in 1985 and takes him to 2015. Then old Biff realizes the Delorean is a time machine. Old Biff steals the Delorean and travels from 2015 to 1955 to ...
42
votes
7answers
1k views

Why does George Mcfly employ Biff to wax his car after he had previously tried to rape his wife?

In Back to the Future, Marty goes back to 1955 and devises a plan for his father George McFly to win over Lorraine in order to ensure Marty's survival. The plan involved Marty pretending to sexually ...
44
votes
6answers
2k views

Why does Harry only make use of time travel in The Prisoner of Azkaban?

At the end of The Prisoner of Azkaban, Harry and Hermione travel back in time to save Sirius (and as it turns out, Buckbeak) and escape the Dementors. If this is a legitimate option for saving ...