KSP
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Puppet
KSP kerbal puppet can be found in Skunk storage bay on some landing pads
Cat
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Mine
There is special tracker mine, stationed inside toroid asteroid in FO. It plays music upon activation and show cat image on explosion.
Retro Posters
Inside the Albion Skunk a poster of an iconic X3: Albion Prelude image is visible on one of the walls of the crew quarters. There are other such posters around the quarters of various different old Egosoft games as well.