Ok, I can answer all.
1. To get the Star Egg, win the Look the Other Way game in the casino 100 times. It may take more than 45 mins.
2. Extra 1 is one of the more annoying levels in Yoshi's island (wait till Extra 4 or 5 though.... *evil grin*) remember: Poochy ALWAYS goes in whatever direction you are at/facing. Try to board Poochy and navigate the slowly-scrolling obstacles as best as you can. The title insists that if you mess up, it ian't Poochy's fault, but your own. I disagree though, as the dog tends to scroll off the screen at the most inoppurtune times.... (I hate Extra 1. I like Extra 2 100x better. It is my second favortie level in that game, besides 4-4.)
3. The best way to win this game is to place the controller on a flat surface (e.g., your left hand or the floor) and rotate the analog stick with your PALM, not your finger. This can cause blisters though.... I can get 58 spins in the Mecha Shy Guy Game..... can anyone do better?
4. Hmmmmmm lemme see if I can remember....
One of them is on Mt. Rugged somewhere.
One is in Forever Forest, in the middle of one of the groups of trees.... (look for an opening to the center of an area in the background)
One is on Lavalava Island: After you exit the volcano, get the treasure (It isn't too far away....) and go see Kolorado. He will trade the seed for the treasure.
The fourth, I think, is given to you in Toad Town, don't qoute me here though.
And those are my answers. Good luck!
*My real signature went on strike, said something about "unfair working conditions". So, this is a temporary replacement sig, until I can work things out with the real sig.