VERSIONS
This game currently has 4 different versions, 3 NTSC and PAL. Your game’s version number is on the backside of the disk. It’s difficult to read. On one of the inner rings, there is some text that says .xx You have either 1.00, 1.01, or 1.02. The PAL version is the one sold in Europe and Australia, and does not have the numbers on the bottom. The differences between the NTSC and PAL versions are:
Marth falls over from Fox's shine in PAL.
Bowser, Kirby and Yoshi are heavier in PAL.
Marth, Fox and Mario are lighter in PAL.
Falco's d-air now only spikes for the first half of the animation. The rest sends them slightly up.
Sheik's u-air isn't as strong in PAL.
Marth's d-air is meteor smash, not a spike, in PAL.
Fox's down and forward smash are less powerful in PAL.
Yoshi's f-smash is more powerful in PAL.
Peach's dash attack is less powerful in PAL.
Luigi's n-air is less powerful in PAL.
Ganon's d-air was weakened, from 22% in NTSC to 21% in PAL.
Yoshi's d-air was weakened, from 44% in NTSC to 36% in PAL.
DI on Sheik's d-throw has been changed so that it can no longer chain in PAL.
Fox can tech out of Falco’s d-throw in PAL.
Bowser's d-throw hits Mr. Game and Watch in PAL.
Link's super jump glitch was removed in PAL.
Samus's extended grapple beam was removed in PAL.
The IC freeze glitch was removed in PAL.
The Japanese language option was dropped in PAL in favor of Italian, French, Spanish and German. Jigglypuff also sings (Up+B) her name in the language Smash is set to.
Names can now include upper and lower case letters, but there is no Japanese character set.
In the English language setting, distances are measured in meters.
Lag and loading times have been reduced in PAL.
The Special Movie was removed in PAL.
^^^ That list is from SWF and MrSilver, meaning that I take no credit for it.
The differences between the three NTSC versions are changes such as increasing the length of HRC track from ~4.4k ft to 11347.2 ft and removing some glitches- notably, Bowser's Flame Cancel glitch and Link and Young Link's Super Jump glitch were removed from 1.0 to 1.2.