Theory:SJA television discontinuity and plot holes/The Nightmare Man

From Tardis Wiki, the free Doctor Who reference
If you'd like to talk about narrative problems with this story — like plot holes and things that seem to contradict other stories — please go to this episode's discontinuity discussion.
  • The Raxacoricofallapatorian is credited as a Slitheen family member, but has a few differences. The colour of the skin is a darker green, and the colour also covers the stomach, where as a Slitheen's fades. The fingernails were also green at one point.
Different members of the same species can have varying phenotypes/appearances, just like humans. There isn't any reason why all members would look exactly the same.