When Marty arrives at the 1950's town and is about to be run over by a green car, the whole filming crew is reflected on its door. See more...
The opening sequence with the ticking clocks is a direct lift from The Time Machine (1960). See more...
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The entry you are marking as a duplicate is:
|Title||Back to the Future|
|Original entry||In 1985 Doc is living in what was in 1955 his garage/workshop after the Brown mansion burned down (note the newspaper clippings at the start). Looking at the appearance of it in the different years you can see that they are same place. This also explains why Marty looked at the garage so intently when he first arrives at Doc's house in 1955, he must have been surprised to learn this.|