Muffs/beard, mortified pea comb, green legs (however legs do vary a lot), etc...
These for example:
(Not my Pics)
Many hatchery lines are bred through crossing EE x EE
Where as my girl:
Have had, but they were all cockerels, and not the common hatchery ones. I also currently have one but she's not the stereotypical hatchery EE either, which I assume is what they are getting.
But generally they are supposed to be friendly, you'll get some nice eggs.