Trivia: When filming the scene where Marty is being hanged from the clock tower, Michael J Fox agreed to really hang from the rope. Whilst filming, Fox held the rope away from his throat with his hand. At one time he wasn't holding the rope and was really being strangled. The film crew didn't realise, they just thought it was really good acting, until he passed out.
Trivia: The band playing at the Hill Valley festival is rock band ZZ Top (two guys with long white beards playing guitar, and a drummer), who wrote songs for the film.
Trivia: Doc tells Clara several times that Jules Verne is his favorite author. There is a serrated rail on the cow catcher of his locomotive time machine that is nearly identical to the rail on the front of the Nautilus in Disney's adaptation of Jules Verne's 20000 Leagues Under the Sea.
Trivia: In BTTF 1, the first words in the movie are from the radio, and it is an ad for Statler Toyota. When Marty sees the black truck, before he time travels, it is being driven to Statler Toyota. When Marty walks into Hill Valley 1885, there is a billboard in the background for an honest Joe Statler, who buys, sells, and trades horses. Seems like the Statler family has been in the transportation industry for quite some time. (00:26:55)
Trivia: The gizmo on the back of the car that is the "Mr. Fusion" is actually a coffee bean grinder. My parents have that particular model. (01:48:00)
Trivia: When Marty and Doc are looking at the map, finding a straight route for the train to take, for a moment the clock (the one that will be put in the clocktower later) can be seen. The time shown is about 10:04 AM. While the time at which it will freeze in 1955 is 10:04 PM, visually the times look the same.