Most likely is, has the following:
Sword on the wall at top of screen - Nariko
White cat under bus- Toro
precursor text on lisence plate that translates to 'Morgan' - Jak&Daxter
Lombax text on type writter that translates to 'Dear Copernicus (etc more stuff) - Ratchet&Clank
Reflection in windshield - Drake
Blue/Yellow boxes on desk - Parappa
and several other details.