10. UNCLE ‘JAILBIRD’ JOEY IS USED TO BEING BEHIND BARS.
Lorraine serves the family a cake for Marty’s unseen uncle Joey in 1985, which was supposed to celebrate his freedom from prison before he didn’t make parole.
Joey’s penchant for the slammer is brought up again when Marty sees baby Joey in 1955 when his mother says, “Joey just loves being in his playpen. He cries whenever we take him out so we just leave him in there all the time.”
11. THE MCFLYS LOVE MEATLOAF.
Marty’s dinner when he arrives home in 1985 is the same dish Lorraine and her family eat when he meets them in 1955. Marty technically eats the same dinner two nights in a row in two different years. In early drafts of the script, Marty hated meatloaf.
12. LORRAINE LAYS OUT THE PLOT.
During the 1985 dinner, Lorraine essentially lays out the plot of the entire movie. Linda asks, “How am I supposed to ever meet anybody?” and Lorraine responds, “Well, it will just happen. Like the way I met your father.” Then Linda responds, “That was so stupid, Grandpa hit him with the car,” to which Lorraine says, “It was meant to be. Anyway, if Grandpa hadn't hit him, then none of you would have been born.”
Based on Marty’s time traveling, with his brother and sister disappearing from a photo he keeps in his pocket, this is exactly what he’s trying to fix.
13. THE MCFLYS ARE BIG FANS OF THE HONEYMOONERS.
The 1985 McFlys watch the same episode of The Honeymooners as the 1955 McFlys. The episode, entitled “The Man From Space,” foreshadows the moment when Marty dresses up to scare George into taking Lorraine out on a date. The episode actually aired on December 31, 1955, which is over a month after Marty travels to the past on November 5, 1955. Oops!
14. MARTY LOVES PEPSI FREE.
The caffeine-free soft drink, which was phased out in real life in 1987, can be seen on Marty’s headboard when he wakes up late for Doc’s experiment, and he then tries to order one from the bewildered owner of Lou’s Cafe in 1955.
He also has trouble opening an old-fashioned capped bottle of Pepsi at the Hill Valley gas station, but George helps him. It was likely that Marty would even have trouble opening a bottle in 1985—twist-off caps weren’t invented until 1988.
15. WHAT’S THE NAME OF THE MALL?
Marty shows up to witness Doc’s science experiment at the Twin Pines Mall, but when he returns later after going back to the future, it’s the Lone Pine Mall. That’s because Marty destroyed one of Old Man Peabody’s dual pine trees on the 1955 farmland where the mall is located in 1985. In real life it’s actually Puente Hills Mall in City of Industry, California.
https://www.mentalfloss.com/article/549729/back-to-the-future-things-to-look-for-mistakes 
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