On Mon, 15 Jun 1998, Phuc Tram wrote:

Maybe someone should post a list of the things that seem to be taken for
granted as true and debunk them as either fanfic convention, anime vs
manga conflict, fanfic writer has too much testosterone at the moment...

Nabiki doing any sort of adult business activity such as playing in the stock
market.  It's certainly possible, and maybe even suggested by the Kinnosuke
story, but most people who use it just got it from another fanfic.

Shampoo constantly drugging food.

Ranma's mother as intelligent and perceptive.

Ranma's mother not knowing of the curse.

Ryouga constantly getting lost in Australia, India, New York, the planet
Mars, alternate dimensions, etc.

The pool of drowned twins splitting Ranma into male and female.

Mousse having to beat Ranma to get Shampoo's hand.  Or having to beat
Shampoo.  Or variations with other Amazons and non-outsider males.

The dragon's hair still affecting Ranma after the Dragon's Hair story is
over.  (This may be a little less common now, since the story has now been
released in English.)

Tsubasa as a recurring character.  (He appeared in one manga story and left.)

Cursed people not aging in cursed form.  (Re: Tarou)

Tneshin Amaguriken as an attack: appears in anime, not in manga.