Freddy's glove tends to look slightly different every time we see it.  It looks like the fingers are getting bigger with every appearance.  In the first three films the glove is very clean and fitting.  Then in Nightmare 4 the glove has a dirty look to it.  In Nightmare 5 and Freddy's Dead the glove looks bigger and has an angled back plate.  Freddy Vs Jason's glove looks like it's trying to go back to the original glove look with a Freddy's Dead size.  Of course Wes Craven's New Nightmare hand is completely different, being based off of the Nightmares one and two theatrical posters.