Dr. Zoo has treadmills capable of getting someone who's overweight back into shape in hours. He also has a large floating airship the shape of a pufferfish.
(Hotel Oblivion issue #1)
Eiffel Two is the second Eiffel Tower, constructed after the first one was destroyed (during the events of The Apocalypse Suite) and will lead Frances "aggressive plan to explore the cosmos."
(Hotel Oblivion issue #2)
(Hotel Oblivion issue #5)
Obscura can warp holes into walls of considerable thickness.
(Hotel Oblivion issue #4)
The Seance communicates with the ghost of Reginald Hargreeves, who still ignores him. We also see what could be Hargreeves true form.
(Hotel Oblivion issue #4)
Klaus earlier noted that it was hard for him to come in contact with his adoptive father.
(The Apocalypse Suite issue #6)
Klaus also communicated with the ghost of Pogo, a hyper intelligent chimpanzee.
(Dallas issue #2)
Reginald Hargreeves is a wealthy entrepreneur and world-renowned scientist, as well as an inventor (of the Televator, the Levitator, the Mobile Umbrella Communicator & Clever Crisp Cereal), and Olympic Gold Medalist, recipient of the Nobel Prize for work in the cerebral advancement of chimpanzees and a space alien.
(The Apocalypse Suite issue #1)
Medusa is a nuclear robot created by the Perseus Corporation, that can levitate has a beam that can skeletonise people.
(Hotel Oblivion issue #4)
Medusa can levitate people and objects.
(Hotel Oblivion issue #5)
St. Zero is Space Boy's hero, and the reason he originally went into space. Thanks to the effects of Afterspace, he hasn't aged at all in his decades of being trapped in Afterspace. Luther also comments that he's discovered Martian simians on Mars, who are apparently dangerous.
(Hotel Oblivion issue #5)
Dr Zero discovers a tear in the fabric of Afterspace, which leads to the pocket dimension in which Hotel Oblivion is located (being directly called a pocket dimension). Hotel Oblivion is located on one of multiple planets seen in this pocket dimension, with myriad stars floating in the distance.
(Hotel Oblivion issue #5)
The criminals kept captive in Hotel Oblivion escape through the Televator back to Earth. The Televator creates a light so great it's seen from orbit, where the Scientific Man is residing (you can even see the layer of atmosphere around the planet).
(Hotel Oblivion issue #5)
The Scientific Man disintergrates someone then flies away. Allison notes that he would have sensed her and Five, but didn't care about them.
(Hotel Oblivion issue #5)
The mother of Murder Magician's baby transforms into a monster.
(Hotel Oblivion issue #5)
Hotel Oblivion self-heal from any damage it takes.
(Hotel Oblivion issue #5)