This is one of the games I attempted TASing but gave up on.
Since it doesn't look like I'll ever complete a publishable movie, I'm posting all the tricks/glitches and info I remember.
My first thought was "How many players / what mode?".
I tried out the 4-players option, but was soon demotivated by how difficult it was to control 4 players simultaneously and how long a single game took (10 ingame minutes = ~14 minutes!). Imo, it would definitely be quite an accomplishment if someone actually made a 4-players movie!
So I took a break from the game and started again a few months later.
This is what was done back then.
http://dehacked.2y.net/microstorage.php/info/147003646/NWC%20demo.fcm
I later regretted the own goal, I thought it was funny but I should have played with the goalie more and then should have used the own goal glitch or something (If you pass and the ball is inside your goal in the first frame of the shot, the game somehow thinks you have scored a goal.)
http://www.youtube.com/watch?v=sRYMkTdfG54
Out of Bounds - Glitch
http://dehacked.2y.net/microstorage.php/info/729093554/nwc2.fcm
Basicly, if a player is just about to land from a diving header, and he gets hit by a powershot, he flies through the ground.
I wanted to use that one and let the enemy shoot into my goal, and the ball should stop just when the game ends.
Another glitch
http://dehacked.2y.net/microstorage.php/info/1986861508/nwc3.fcm
If hit by a powershot after performing a bycicle kick and recovering from the lag frames of said bycicle kick, you fly as if you were hit, but your player still performs whatever move you wanted to do. This way, you can go up really high while performing another bycicle kick or a diving header. This does also work when the goalie shoots the ball or when walking across stones (only in multi-player mode).
Funny use of the above glitch
http://dehacked.2y.net/microstorage.php/info/1407175864/nwc1.fcm
I used the above glitch to perform a diving header while flying high through the air. The ball is stopped by the goalie and promptly shot away again. I hit the ball with the diving header which produced a powershot which is high above the ground.
*You can score from corner balls.
*Enemies can't hit you when you are in a proper location.
*The goal actually has poles which can be hit with a diagonal shot. (The ball only has to fly slightly diagonally)
This is all I can recall atm.
If there are questions or someone is going to make a TAS using these tricks, don't be afraid to ask for help.