These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
In The Howling II, Reb Brown's hammy screaming is exactly like his idiotic screams in Space Mutiny.
In The Howling II, Reb Brown and Christopher Lee are allies. They previously appeared together in Captain America 2: Death Too Soon, where Lee (as the Big Bad) delivers the classic "Maybe in another lifetime we could have been friends" speech before dying; Reb (as Cap) says "I doubt that very much". Guess you were wrong on that one...
Narm: Karen's werewolf form in the first film looks like a terrier.
Sequelitis: None of the sequels are regarded as being anywhere near as good as the original, though even among the other sequels IV and New Moon Rising are regarded as being particularly awful.
So Bad, It's Good: The Howling II, which is incidentally the only one of the films with which the author of the original book trilogy, Gary Brandner, was directly involved (he co-wrote the screenplay).
Special Effects Failure: Applies to most of the sequels, to varying extents. III has especially awful effects, with no real transformations to speak of, barely any gore and really bad werewolf prosthetics (all the more shocking considering that the effects come from acclaimed Aussie makeup artist Bob McCarron). New Moon Rising manages to be even worse, with its werewolf being realized via a cheap mask and some lame CG morphing effects.
Visual Effects of Awesome: Rob Bottin's effects in the original still stand out as some of the best werewolf transformations of all time. Among the sequels, VI has easily the best effects after the original, though IV has surprisingly decent effects too (albeit only in the last ten minutes), considering the obviously extremely low budget of the film.