BoJack Horseman's phone contacts include Pierce Brosnan, Sandra Bull-Ox, Gerard Butler, Rose Byrde, Nic Cage (DON'T CALL), Charlotte, Chipotle (DO CALL), Jurj Clooners and Penelope Cruz.
The "U-Boot Typ 206A" submarine shown as schematic in the intro is a really existing type of German submarines, which was in service in the German navy until 2011 and is still used by the Colombian navy.
After the opening title sequence when the camera is showing Philbert's post-apocalyptic house, a bird flies by in a hazmat suit. The color of the suit is the same as that of Vault Boy in Fallout (1997), which is set in a post-apocalyptic America.