This single part of F9 ruined the entire movie for me.
I can put up with the long lost brother, Han faking his death, going to space, everything. All of those things are either ridiculous or impossible, but they all fit within my theory that the Fast & Furious franchise is a fantasy series set in modern times. But putting the dad's crash in 1989 is literally impossible within canon and cannot be squared with any other part of the franchise.
I understand that they did it to align Dom's age with Vin's, as Vin Diesel was 22 in 1989. But if Dom's in his early twenties in 1989, that puts him in his early thirties in 2001 when the first film takes place. Which is plausible, but not really what was implied at the time. While the film never said his age, the impression given was always that he was in his early to mid twenties. It also messes with the ages of everyone else in the original crew, but Letty is the only one who really continues on and there are already a decent number of continuity errors in their relationship so it's whatever.
But things really get screwy when we see that Mia is a teenager when her dad dies. At some point later in the film, Letty mention's Mia was 16, which retroactively puts her at 27-28 in the Fast and the Furious. And that just doesn't fit because in the original film, she's in school. She's implied to be either a senior in high school or a freshmen/sophomore in college, but definitely in school since she was doing homework when Dom and Brian showed up. Yeah, you can go to college at any age, but it's established that she's under 21 because nobody will let her drink.
1999 I would have believed. It'd be a bit tight of a timeline for Dom to go to prison and then start doing heists, but not overly so. 1995-1996 would be more reasonable, if Mia was 13-14 rather than 16. I know that this is a series that has gone of the rails and can't keep track of itself, but they really missed the mark here. Despite how small of a thing it is, it really bothered me and I spent the rest of the movie trying to figure out the timeline of the 12 years we've never seen.
