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At the start of Back to the Future, Marty uses Doc's video camera to record Doc saying among other things, that the experiment is at the "Twin Pines Mall"

Shortly after this Marty throws the camera in the Delorean, takes off and accidentally runs over one of those twin pines in 1955.

1955 Doc watches the tape, but conveniently talks very loudly at the point where 1985 Doc says the location on tape. You can't really hear him say the location.

Marty eventually brings the Delorean and video camera back to 1985 to the new "Lone Pine Mall". What is on the video tape now?

If you watched the tape would Doc say Twin Pines, or Lone Pine?

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    Since we see time catching up with Marty in "Marty Time" - example: his fading in the photograph during the dance scene - it would follow that the tape would "update" any changes in the timeline. Lone Pine Mall. – Integration Feb 14 '17 at 11:14
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    The ripple effect was probably already working, so in the movie, they don't let you hear the location so they can save the joke for the end. – John Sensebe Feb 14 '17 at 11:33
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The tape that the original Marty brought with him to the past would still say Twin Pines Mall. He gets to the mall a little too late to warn Doc about the Libyan attack and watches the NEW Marty speed off and go to the past in the parking lot, taking with him a new tape with Doc saying that he's standing at the Lone Pine Mall.

The photograph that Marty brings with him gives us the insight we need to determine this. Although the people in the photo started to disappear as Marty's parents' relationship became more distant, everyone came back after George punched Biff and kissed Lorraine wearing the SAME clothes as before.

We know that George socking Biff greatly affected his confidence and success. We know the rest of the family follows suit because everyone is in a lot better shape, the house looks nicer, they're wearing super nice clothes (by 80's standards), etc. The items that Marty brought back from the original future stayed the same even after events that changed them in the new future had already taken place.

If we follow this logic, the NEW Marty that left from the Lone Pine Mall would have an updated picture of his siblings, as well as an updated version of the videotape in which Doc Brown says he's standing at the Lone Pine Mall.

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  • A good answer, however a lack of evidence. Are there any lines from the film you could provide to help with your reasoning? – Edlothiad Feb 14 '17 at 23:49
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    Unfortunately the 1965 Doc refuses to talk about the future and is just learning about the elements of time travel, so there is no dialogue in the film to support the claim above. However, blood at a murder scene can be a lot more damning than a spoken confession. Dialogue is the confession and the photograph is the blood in this scenario. – Yankimer Feb 14 '17 at 23:57
  • well said, +1 from me for a concrete answer that's well explained. – Edlothiad Feb 15 '17 at 0:27
  • +1 That's a good point - the photo did not change, so by extension we can say that it is unlikely that the video changed. – JK. Feb 15 '17 at 4:28
  • I feel like both this answer and the answer below raise good points. Unfortunately with time travel it's hard to prove what would happen. – Integration Feb 15 '17 at 15:33
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Have to disagree with @Yankimer, the video tape would have said "Lone Pine". The point that their clothes did not change is a bit tenuous. It just means their taste in "casual" clothes which they were wearing when the photo was taken didn't change, even if Dave now wears a suit to work. This is similar to how they still live in the same house at the end of the movie instead of in a richer neighbourhood. It may seem unlikely but it's fine for "movie logic" as one of the Bobs calls it. (In fact, George & Lorraine should have completely different kids because if their amourous behaviour at the end is anything to go by, they would surely have been having a lot more sex!)

On the other hand, any other changes seem to "catch up" with Marty and the new situation replaces the old as the causes of the changes happen - especially in the sequels when they see the changing newspaper headlines & photo of the gravestone - but even in the first movie the photo depicts his family disappearing when it looks likely that George and Lorraine will not get together. If the photo is changing as a result of them not getting together, then why would the video not change when Marty ran over one of the pines?

It appears the only thing that does not change is the time-travelers' own memories.

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  • I like this answer, especially as in the third film Clayton Ravine changes to Shonash Ravine then to Eastwood Ravine – Cearon O'Flynn Feb 15 '17 at 15:01
  • +1 but I don't know which answer to accept as correct now :) – JK. Feb 19 '17 at 5:55
  • I don't think you are disagreeing with Yankimer, he says the video will be updated. – Paul Feb 20 '17 at 12:11
  • @Paul No he is saying only the "new" Marty (i.e. the one seen speeding off at the end of the film) will have a tape saying "Lone Pine" but the video "our" Marty has will still say "Twin Pines", whereas I'm saying the video that "our" Marty has will have changed to "Lone Pine". – colmde Feb 21 '17 at 8:41

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