Infinite Goals:
When you score a goal, after the ball has crossed the goal line but before the celebration cut-scene has started, pause the game and select Instant Replay. Everytime you watch a replay of the goal your score will increase by one.

Swapping Awesome Players to Your Team:
Go to edit mode. Go to registration player, then select the team that has the player first. Next, select the player that you want to move. Another half screen will appear with the team names on it. Select the team, and when you play a match with them, he will be where you set him to be.

Thanks to Revolution readers pitch perfect and adil!