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After Marty runs out of the saloon in 1885 into the street be gets dragged by Biff. As he is being dragged you can see a film crew running beside him. If you have it the box set you can kind of see shorts, leg and sneaker, but if you have an older version or see the movie on TV you can see 2 people and the camera. See more...
Trivia
Looking for the three films at a whole, we can note that no fewer than FOUR DeLoreans were simultaneously existing in 1955: (1) the one in which Marty comes in the first movie; (2) the one in which the old Biff comes in second movie to give the Sports Almanac to his younger self; (3) the one in which Marty and Doc comes in second movie to rescue the Sports Almanac; and (4) the one which Doc hid in a mine in 1855 to be found by Marty in the third movie. See more...
Back to the Future Part III (1990) - 20 quotes
Directed by Robert Zemeckis, starring Christopher Lloyd, Elizabeth Shue, Lea Thompson, Mary Steenburgen, Michael J. Fox, Thomas F. Wilson (add more)
Marty McFly: You're the doc, Doc.
Young Doc: Remember, where you're going, there are no roads.
Clara Clayton: I don't dance very well when my partner has a gun in his hand.
Young Doc: Well, good luck for both of our sakes. See you in the future.
Marty McFly: You mean the past?
Young Doc: Exactly.
Doc: Each detonation will be accompanied by a sudden burst of acceleration. Hopefully, we'll hit 88 mph before the needle gets much past 2000.
Marty McFly: Why, what-what happens after it hits 2000?
Doc: The whole boiler explodes.
Marty McFly: Perfect!
Young Doc: All you have to do is drive the time vehicle directly toward that screen accelerating to 88 miles an hour.
Marty McFly: Wait a minute, Doc. If I drive straight towards the screen, I'm gonna crash into those Indians.
Young Doc: Marty, you're not thinking fourth dimensionally. You'll instantly be transported back into 1885, and those Indians won't even be there.
Doc: And in the future, we don't need horses. We have motorized carriages called automobiles.
Saloon Old Timer: If everybody's got one of these auto-whatsits, does anybody walk or run anymore?
Doc: Of course we run. But for recreation. For fun.
Saloon Old Timer: Run for fun? What the hell kind of fun is that?
Doc: Marty, you're going to have to do something about those clothes. You walk around town dressed like that, you're liable to get shot.
Marty McFly: Or hanged.
Doc: What idiot dressed you in that outfit?
Marty McFly: You did.
Marty McFly: How many did he have?
Bartender: Just the one.
Marty McFly: Just the one? Come on, Doc!
Bartender: There's a fella that can't hold his liquor.
Marty McFly: Great Scott!
Doc: I know, this is heavy.
Marty McFly: Hey, Doc! Where you goin' now? Back to the future?
Doc: Nope. Already been there.
Doc: Marty, I gave you explicit instructions not to come here but to go directly back to 1985.
Marty McFly: I know, Doc. But I had to come.
Doc: But it's good to see ya, Marty.
Doc: Clara was one in a million. One in a billion. One in a googolplex!
Engineer: Is this a holdup?
Doc: It's a science experiment!
Marty McFly: Listen, you got a back door to this place?
Bartender: Yeah, it's in the back.
Buford: 8 o'clock Monday, runt. You ain't here, I'll hunt you and shoot you down like a duck.
Gang Member 1: It's dog, Buford. Shoot 'im down like a dog.
Jennifer: Excuse me, Doc Brown. I brought this message back from the future and, well, now it's erased.
Doc: Of course it's erased.
Jennifer: But what does that mean?
Doc: It means your futures haven't been written yet. No one's has. So make it a good one, the both of you.
Doc: This'll shoot the fleas off a dog's back at 500 yards, Tannen! And it's pointed straight at your head!
Marty: Clara Clayton was supposed to die in the ravine. All the teachers tell the kids a story about a schoolteacher named Clayton who died in the ravine, and all the kids in town remember it because they all have a teacher they'd like to fall in the ravine.
Doc: Marty, you're not thinking fourth-dimensionally!
Marty: Yeah, right, I have a real problem with that.