The old man who wishes he had bet on the Cubbies is played by Charles FleischerCharles Fleischer, who did Roger Rabbit's voice. He also plays the younger version of his character, Terry the tow truck driver in 1955.
A scene in which Marty meets his brother, Dave (played by Marc McClureMarc McClure), in the alternate 1985 was eventually cut because Wendie Jo SperberWendie Jo Sperber (who played Linda, Marty's sister) could not reprise her role because at the time, she was pregnant.
The tagline for Jaws 19 is "This time it's really, REALLY personal".
When Marty visits his neighborhood in 2015, a dog can be seen in the background being walked by one of the robots from *batteries not included.
Marty's denim jacket from the first movie is for sale in the antique store in 2015.
In this movie there is a scene in which Doc Brown holds a conversation his 1955 counterpart (who is unaware of who he is talking to). During this scene Doc is wearing a brown trenchcoat and hat. If you look carefully in the first movie, you can see a man dressed exactly like this (and therefore, presumably Doc) walking away shortly before the clock-tower scene.