I watched an old (1994) episode of the South Bank Show last week. It's a look at Clive's 'controversial literary journey into the darker reaches of the human experience'. Wonderful!
There's a small section on Nightbreed, during which some other dude shows off a prop/creature that never made it to the film. It's a fantastically bizarre little critter, boasting a large mouth of gnashers instead of a groin.