Some treasures are cameos to other Nintendo series. These include:
- The Flame of Tomorrow exhibits the text 'Bowser Breath Brand' with a picture of Bowser.
- The Master's Instrument says 'Mario paint', a possible reference to the game Mario Paint.
- There is another mario paint reference: the Decorative Goo, which bears the label 'Mario Paint--Blue'.
- The Unspeakable Wonder resembles Princess Peach's crown.
- The Cosmic Archive is a Japanese Famicom game.
- The Dream Architect is a Game & Watch.
- The Implement of Toil says 'Nintendo 64' on it.
- The Remembered Old Buddy is the head of a NES R.O.B., the gyro blocks being R.O.B. blocks.
- The Gyroid Bust is, although fairly altered, featured in the Animal Crossing series.
- Pokos resemble coins from the Mario series.
Many Pikmin 2 treasures are real-world items, with real-world brands. For example:
- Dr. Pepper is the drink of the bottle cap known as the Drought Ender in-game.
- The Abstract Masterpiece is a Snapple lid.
- The Gherkin Gate is a Vlasic brand lid.
- The Salivatrix is a Dannon yogurt lid.
- The Quenching Emblem displays the 7up logo.
- The Pondering Emblem (NTSC) and Massive Lid have the brand 'Yoo-Hoo', another possible reference, this time to Yoohoo chocolate drink.
- The Alien Billboard is a Kiwi brand shoe polish lid.
- The Boss Stone is a gyokushō piece from the Japanese board game Shogi, also called "Japanese Chess."
- The Yellow Taste Tyrant is a French's mustard lid.
Other such cases are the items in the Mystical Energy Series, which are all Duracell batteries. There is also a hidden song in the game, Totakas song, that is found on the treasure collected screan after comleting a cave.