Hint
Go to the sewer, defeat the lizard, then walk in the sewer until you see a platform, jump on the platform, when you get to the top "get" the goodies, the go left (you will see a small platform above your head) jump on the platform and kick the pipe that is shooting stuff at you, it will open up a secret passage below you. Enter the passage to get more goodies.
Level Select
Press Y, A, X, B, A, Right, Left after Spider-Man appears and lands during the introduction sequence.