|This picture will make more sense in a moment.|
There are many cameos but I am going to focus on what I feel are the most interesting ones:
Anti-Kirby: Anti-Kirbys are Kirbys plain and simple. They even attack Link by sucking him up. Take a look at this picture of one:
Goombas: There are many Goombas throughout the game than can be destroyed by sword or by Mario style stomping. Take a look:
Yoshi: Well, it isn't exactly Yoshi but it is a Yoshi Doll which you can win as a prize and give to a mom in need of one for her baby.
Link's Awakening is available on the 3DS's eShop's Virtual Console and I highly recommend it.