Additionally, after having received the picture of Ayase Eli, Linn uses the phrase "Horosho". This is a phrase that is often used by Eli Ayase.
After having seen the giant lava pit in Mikado's treasure vault, Hayate says: what kind of M*rio Galaxy is this?. This is a reference to the video game Super Mario Galaxy.
Afterwards, Linn asks if B*wser was waiting up ahead. This is a reference to the villain of the Super Mario franchise Bowser.