When Marty drives the DeLorean through time to thirty years in the past, he goes from an empty mall parking lot to the middle of a farmer’s field. The very first thing he sees after the night sky and trees is a scarecrow in the middle of the field.
While it’s pretty common to see a scarecrow in a field, it’s been thought this is a subtle reference to “The Wizard of Oz”. Everybody remembers the Scarecrow on his search for a brain, but it’s one of the first main characters that Dorothy meets when she lands in the strange land of Oz.
Irony, thy Name is Clock Tower
A big part of the film is the clock tower, the lightning that strikes it, and the way Marty and the past-version of Doc Brown use it to send Marty back to his own time.
Marty gets a pamphlet in '85 that tells him everything he knows about when the lightning will strike, urging him to help save the clock tower from destruction. The irony is that Marty and Doc Brown were the reason the clock tower was struck by lightning in the first place since they attach a lightning rod to attract the lightning bolt.
More Foreshadowing
When Marty lands in 1955 and has dinner with his mother's family, they're watching an episode of "The Honeymooners". Marty calls the episode a classic, surprising everyone – mostly since it was the first time the episode aired, and it was even the very first episode of the show.
Looking closely at the television has actor Jackie Gleason dressed as an alien, which foreshadows a trick Marty pulls on his father a little bit later in the movie. It was the only way Marty was able to convince his father to ask Lorraine out, which sets much of the plot in motion.
Not by the Band
When Marty scares his father into asking Lorraine to the dance, he does so with a crazy alien getup and some shocking music by “Edward Van Halen.” The band you're thinking of is “Van Halen,” but why was the “Edward” squeezed in there at the top?
It's because while Eddie himself (R.I.P.) was okay with his name being in the movie, the rest of the band wasn't. So, Eddie whipped up a quick solo for the film, and the prop guys added his first name to the tape, to ensure that no copyright violations were taking place.
More Than Just Johnny
One of the most memorable parts of the first movie was when Marty is conscripted into the band at the high school dance. He plays Johnny B. Goode, one of the most famous rock and roll songs ever – since it was one of the first.
Marvin Berry calls his cousin Chuck to tell him about the sound, a reference to Chuck Berry, the song's actual creator. However, Marty also references other famous guitar players like Pete Townshend from The Who kicking over the amplifier, Angus Young from AC/DC lying on his back while playing, and Jimi Hendrix playing behind his head.