Today being the 23rd anniversary of the premiere of Firefly, I am both, doing a rewatch of the series as it aired should have aired, and started a new community for discussion of the show and related spin-off media.
https://en.m.wikipedia.org/wiki/Firefly_(TV_series)
Put on your browncoat and join us.
How so? I don’t recall any canon breaks, but it has been a long time.
How Simon broke River out is pretty significantly different, that’s the biggest one. A few other small things.
And I refuse to consider “Serenity” canon for other obvious reasons.