Been saving this for a rainy day, I loved it.
And...the Antichrist is actually an Amalgam of two characters.
Whilst the King's Cross/Hogwarts stuff is obviously Potter, as well as the scrubbing of the forehead lightning bolt, check the folder in the records office of "Hogwarts"
http://en.wikipedia.org/wiki/The_Dark_is_RisingAnd as for the "dick" thing.
Don't forget how much modern magic owes to Alistair Crowley, a man who basically did
everything he did in order to get laid and do drugs.
Sex Magick is a big deal within certain circles and the wand/phallus thing has been highly remarked on.
Check out Crowley's "Abbey of Thelema" period to see what I'm talking about.
There's also the metaphysical thing, where Moore is commenting on mass market, repeatedly marketable "pop" fiction.
The fact that "Potter" urinates Quartermaine to death?
DC>Moore>Watchmen anyone.
There's an English expression, "Taking the piss".

Loved all the cameo's as always.
The Bond's, Unit and Torchwood and Doctor's One Eleven and Jack Harkness, The Avengers girl's and Pussy Galore and plenty of British stuff that will probably pass you lot by.
Check for:
Sid the Sexist and Roger Mellie.
The shark is Hookjaw not Jaws.
The Tesco's dig
Gosh Comics
Nemesis the Warlock
Father Ted and Black Books references
A Reginald Perrin reference
Arthur Daly and Terry McCann (Minder)
Treens from Dan Dare
Gene Hunt and Alex Drake from Ashes to Ashes (Life on Mars sequel)
Characters from Spooks
Little Britain and Fast Show characters
Andy Millman is a charater from Ricky Gervaise's Extras.
Appearances from Wurzel Gummage and Thomas the Tank Engine