So, back in the day, Rare's games were always humorous, and would always make references to their own games, the fact that the characters are in a game, or poke fun at other's games. And throughout the adventure, if you did some digging around, you'd find bits and pieces of Rare stuff from their other games, such as music, costumes, or just some text. Now with Yooka-Laylee, what would you like to see referenced, and how would you want it referenced?
If I were to answer that question, I would obviously go for a Banjo-Kazooie reference, and I would hope for something as little as a pair of beaten up, old yellow shorts on a random area on the ground, then later a beaten up, blue backpack lying around in a tree somewhere.
Winners don't lose.