Primo Spiffies Cakes  are rich moist snack cake with filling inside.
Honeymooners at the Sedgewick Hotel called room service for Slivovitz and Primo Spiffies Cakes. The wife was enamored with the cakes and admired all the "gold glitter." Slimer invaded their room and ate the cakes then slimed them.
- In the Ghostbusters Annual 2017, on page 46, the Primos Spiffies Cakes and ad are based on Twinkies and classic Hostess 1 page ads, for example in old Marvel comics books.
- On page 7 of Ghostbusters 101 #1, in panel 4, in front of the Ecto-Plazm, is a white box of Primo Spiffies Cakes.
- On page 8 of Ghostbusters 101 #3, a white box of Primo Spiffies is on the top shelf on the right side of panel 1.
- On page 12 of Ghostbusters 101 #4, in panel 3, on the table is a box of Primo Spiffies Cakes.
- Ghostbusters Annual 2017
- All That Glitters
- Ghostbusters 101