Freeze Timer in the Hercules Cup
When you reach Hercules in the Hercules Cup, press start then select restart. When the match restarts the timer will freeze. This only happens in the Hercules Cup.

Jump over wall at Muddy Path
Another way to reach the immediate second level of Muddy Path other than by hopping into the upward-draft coming from the circular well (which works only when playing the mini-game, "Pooh's Muddy Path") is by executing the following sequence:

Plant Sora directly in-front of wall where Pooh is transported over via the 'blue butterfly flowers' in the mini-game
Regular-jump up (as shared abilities are deactivated while at most though not all of 100 Acre Wood, Muddy Path included) with the 'O' button;
and at your PEAK HEIGHT, swing your Keyblade with the 'X' button
..and Sora should then land barely upon the edge of the ground up there, without even a 'landing' noise produced.

Furthermore, this *glitch* is mucho fun to use for exploring the far corners of Muddy Path when not being timed, 'feeling it out' so-to-speak. Plus, this maneuver is, with a little bit of practice, actually a few seconds faster to reach Pooh than is the traditional method of jumping into the air-current spurting from the well!!!

NOTE: This technique does not work with the taller wall at the other end of the log.

Tidus Parrying Glitch: +4 techpoints instead of 2
The following method is quickest way to level-up whilst on the Destiny Islands (second-fastest is via Wakka's blitzball):

Talk to Tidus. Enter the three-on-you battle (so that you earn +5 exp and a potion at the end). First, take-out the other two opponents (Sephie & Wakka), which isnt too hard to manage at Level6 or higher (bout same degree of difficulty as the Riku duel).

Then, target-lock Tidus and remain locked-on to him. Run around in oval-shaped circles with him tagging fairly closely behind you. Every-so-often (when Tidus is the farthest away while still within reach of your-own wooden sword), quickly turn around and clank swords with him. If executed correctly, you should see a rather bold shockwave circle at the point of clanking (as if two overlapping), and the words 'Tech +2' should appear on the screen, also in a relatively-speaking bold print. The accentuated boldness of the overlapping circles signifies that you scored two times the amount that it said you scored (4tech instead of 2). Note that tech points are the same as 'exp.' or 'experience' points.

Also, by using this glitchstrategy, your battle against Tidus has no designated end, since you arent required to hit Tidus's body.