Very impressive! It's always great to see how much my fellow monster fanatics can recognize the most obscure of sources.
To clarify a few of the last puzzle pieces:
Bela Lugosi, Boris Karloff, and Peter Lorre all appeared together in one film, 'You'll Find Out'. They weren't ghosts in that movie, but I guess they are now, right?
The gorilla suit fella isn't any specific reference, just one of those things that pop up in a lot of old horror films. It could be Charles Gemora, Crash Corrigan, George Barrows...take your pick.
The two-headed guy is 'The Manster', a crazy fun Japanese horror film which inspired the sequence in 'Army of Darkness' with Ash growing a second head (beginning with an eye popping out of the shoulder).
The pale nude woman with the bat wings (between Nosferatu and Mr. Hyde) is from a painting by artist Albert Joseph Pénot, titled 'La Femme Chauve-Souris'. I thought Id throw in a curveball by including a monster not from a movie.
The silhouettes in the far background are (from L to R): Baragon, Rondo Hatton, Peguila (Ultra Q), Rodan and Varan (both of their designs are altered in fear that Toho would come after me...not sure why I bothered), Tom Servo and Crow, the Hydra from 'Jason and the Argonauts', and Gwangi.