I have observed the posted debate between User:FanOfCountry and User:Anythingspossibleforapossible about when information about characters can be put together and when it cannot. I dislike how only the Fan's point-of-view can be seen (since the other talk page with points by Possible has been closed down). I would like to contribute my own ideas, and see what others think.
The continuity divide is strong with the two live-action movie series, but most of the other animated movies, TV series, and comic books are relatively compatible (not Scooby Goes Hollywood, Shaggy and Scooby Doo, Get a Clue, and Scooby-Doo! Mystery Incorporated however).
I'm in favor of accumulating details, and treating as much of the franchise material as possible as being in a single continuity, unless there are clear reasons it cannot be done. Thus "Fred" becomes "Fred Jones" becomes "Fred Herman Jones." But "Velma" becomes "Velma Dinkley" and not "Velma Daisy Dinkley" because that only comes from the live-action movie Scooby-Doo! Curse Of The Lake Monster.
We compromise a bit in giving multiple pages for different sources of biographical details, e.g. Shaggy Rogers/biographical account of comic appearances and Shaggy Rogers/biographical account of novel appearances, etc., but basically we treat all of these as being about the same mainstream character, and create other pages for alternate continuity versions. I would like to see this way of doing things continue.