How many of these were continuations between movies? Wolverine is probably the only character so far that has jumped back and forth between various X-Men and solo movies and doing that did result in mangold removing his original ending for The Wolverine as presumably DOFP got in the way of what he originally wanted to do.
What was Mangolds original The Wolverine ending? Was it a bigger fustercluck than Wolverine losing his adamantium and then showing up with them in DOFP?
After a quick check of my list heres how I read those double characters from the franchise.
Theres a storyline to be told (though I dont really want to see it, and quite frankly were way past it) about how Nick Hoult takes a hiatus from the X-men, takes a government job and later comes back as Kelsey Grammer.
Yukio was picked out of a Fox book of 400 characters by the Deadpool 2 writers. She stood out to them. They admitted to it. And theres a big chance they didnt know shes already premiered in The Wolverine. An odd thought considering how the Deadpool franchise keeps referencing the Wolverine franchise.
The Caliban from DOFP is obviously not the same from Logan, for one thing, the ages dont line up. I mean youre more than welcome to make excuses for it but even Mangold admitted to it.
It could be said Cudmore becomes Deadpools Colossus. Though he somehow gained a Russian accent.
Who knows when New Mutants film is set but when it comes to Sunspot, theres a good chance this is one of those born in a different decade from the DOFP time travel shenanigans.
The best explanation for the two Emmas is still Emma Silverfox and Emma Frost. And
thats still pretty bad.
Born-in-a-different-decade Jubilee.
Born-in-a-different-decade Angel.
Born-in-a-different-decade Psylocke.
Dead Kevin Bacon Shaw vs. Quick Cameo Shaw.
X: O Wolverine Cyclops, Quick First Class cameo Scott, X:A Cyclops
X: O Wolverine deleted cameo Ororo, Quick First Class cameo Ororo, X:A Storm
Trask is the easiest to explain on here. Bill Duke simply had the same last name (based on whats shown on film) or full name (based on film credits).
Evans Toad can still become Ray Park.
Liev gets more feral and becomes Tyler Manes Sabretooth?
Forgot to mention a big one that has no explanation whatsoever, and shows the utter lack of planning. Moira MacTaggert.
So to restate your original question, how many of these were continuation between movies? And how many of it are just fans coming up with excuses when the filmmakers themselves didnt give any of them a second thought?