When Kreiger is engaging in a cocaine-fueled gun modification, he is singing and air-drumming "Tom Sawyer", released by Rush in 1981.
The alias disguise 'Carl Channing' used by Ray is a reference to Carol Channing, a singer, actress, comedian, and gay rights advocate.
On a ship, viewers see Tiffy without her helmet. She looks remarkably like Kristen Schaal, who voices the character.