Feel free to contribute! I'm kinda feeling lazy. (By the way, there is a grave lack of arcade cabinet icons so I'm choosing the game and watch one.)
1) CPU crouches and gives you low kicks whenever a player character walk toward it, and good luck trying to do the same to it.
2) CPU jumps backward with pixel precision to avoid being hit when it's a few hits away from being defeated.
3) CPU will relentlessly jump punch a cornered player character if it tries to jump. trickery and/or luck is needed to fool the cpu and jump away from an arena's corners.
4) CPU will jump punch a jumping player character with pixel precision, almost always having priority over the player's moves, and often reads the player's inpout, ensuring an easy uppercut or a special move if the player does its move sooner than the CPU could have.
5) CPU will often throw the player character in mid-air (i.e. after being frozen, or after a blocked cannonball move's recoil), something that is naturally impossible to do by the player.
6) The AI controlling Shang Tsung reads the player's input and reacts according to its moves with great efficiency thanks to his ability to morph in and out at any moment. (i.e. Tsung morphs into Raiden, teleports out of range of sub-zero's slide or raiden's own air slam, then switch back into normal form to launch three fireballs before morphing into goro(!). time taken: roughly 5 seconds.)
7) CPU generally has higher priority when in situations where both characters are using the same move, for exemple high punches or leg sweeps.
1) After an air slam, blocked or not by the player's character, Raiden will move forward without reacting to any attacks coming his way.
2) Jump backward, jump forward while doing a jump kick. It's a cheap but powerful exploit as the CPU only react to those moves near the end of the game (the third endurance match, for exemple), and will only rarely block the kicks even then. it's a safe way to tip a losing match back into the player's favor as long as the pattern is not broken by the CPU using a special move. Learning to efficiently block is recommended as the player can block said special moves and resume the pattern quickly.
3) step backward once and immediately jump toward the CPU character while kicking. It is similar to the exploit above, but it is much less reliable as the CPU is more likely to block the kick. (On a related note, this is the exploit of choice when fighting Kintaro in Mortal Kombat II.)
1) Often, Sonya will make a regular MALE pain sound when fatalities are done against her.
2) Kano's scream during his victory pose regularly cut off the announcer's voice. ("Ka-YEAAAH! ..... Flawless Victory. Fatality.") and vice-versa.
3) It is possible to freeze a dizzied opponent in round 2/3 without killing them, but it only seems to be possible if it's done immediately after the cpu is thrown, said throw being the attack that defeats the opponent. Doing sub zero's spine rip fatality on the frozen opponent results in something similar to this http://www.youtube.com/watch?v=O8GVH49sh58