Calvary Guidon in Back to the Future III - 1885
In Back to the Future III, Marty travels back to 1885 in order to save Dr. Emmit Brown from his tragic end. Upon returning Marty happens to jump back in the middle of a US Calvary and Native American Chase. The US soldiers carry a specific type of military swallow tailed flag - known as a guidon - that originates from a heraldic battle standard.
Back to the Future II - 2015
In Back to the Future II - Marty travels into the future to save his son from making a big mistake in Cafe 80s. There is a US flag sticker or print on the the wall that you can barely see. It is behind the television, but you can see the US flag in the holes of the auto-television servers. The pop star on the television is supposed to be Michael Jackson.
Pink! - Alecia Beth Moore
In this alternate 2015 Hill Valley where George McFly is a science fiction writer, the world has changed and robotic tele-servers were created in the mid 1990s as well as hover technology. We exist in the Hill Valley were George McFly never became a science fiction writer and subsequently never inspired others.
Also in this alternate 2015 future our musical pop star artist 'PINK!' does not pursue a musical career. Instead she moves out to California in Hill Valley to become a famous movie star in 2017. The weird thing is that pop star Pink! is sitting at the counter looking at another classical American pop star - MJ - who is also still alive in this alternate happy technology inspired future by George McFly.
Nancy Reagan with an American Flag Dress
Cafe 80s - 2015
Also in Cafe 80s there is a cut out of Ronald and Nancy Reagan dancing on the wall. Mrs. Reagan is wearing a dress made out of an American Flag. This is so appropriate since the 80s were Reagan's decade. He was elected in 1980 and was in office until 1989. Because of medical advances inspired by George McFly and stem cell research - Ronnie and Nancy are alive and well in this alternate happy techno future. In this timeline Ron and Nancy can still do the Fox Trot - Ronnie is 104 and Nancy is 94.
You don't see too many flat screen TV is Back to the Future II because it's Cafe 80s and they wanted give it a real 80s feel. Besides in this alternate 2015, society tends to recycle TVs instead of throwing them away.
Link to Part XII