In the hallway of the 8th floor "Paranormal Productions", there are posters that reference past titles that the game's developer Next Level Games worked on. In order there's a poster of Mario about to kick a soccer ball (Super Mario Strikers), a poster of King Boo and Luigi (Luigi's Mansion: Dark Moon), A poster of the overhead silhouetted cast of Mario Strikers Charged, and a poster of Little Mac, Doc Louis, and Mr. Sandman (Punch-Out!!). If Luigi sucks the last poster with the Poltergust, it will reveal a green boxing glove resembling that of Little Mac's.