Cook Kirby can be interrupted in Turbo Mode.

Propably not a bug, but... If Kirby copies Charge Beam, his orb ball thingy still has the size Samus´s had in a previous patch.

When ZSS, using her FS, somehow got KO'd at the top kill zone (e.g something dragged ZSS to the zone), she got KO'd normally instead of Star/Screen KO.

I discovered this glitch a while back, but I never got around to posting it until now.

When using Goku, if you teleport right when Kaioken wears off, he'll go flying across the screen. Just like in the anime!

https://zippy.gfycat.com/SnarlingThisArrowana.webm

With Zero Suit Samus, if you use her tether recovery on the stage, Lunar Core from Final Fantasy, you can grab the edges that are located below the stairs...

I was playing as Kirby in Final Destination against a Lvl 5 Mario CPU on a 1 stock match with time turned off. I was near the edge of the left side of the stage. I grabbed Mario and did a forward throw of the ledge. The screen went black and the announcer said "Sudden Death!". The screen did not change back and I had to restart the game. I do not have a replay because I could not make one.

Samus's bombs can hurt shielded foes.

The same with Link's bombs, sometimes even when my shield is at full strength, the bombs explosion will break through it.

If you try doing a ledge grab on the left side of Clock Town and attack, you will fall down. The right side is normal. I discovered this when I was playing Mario vs Fox, but I just made a game showing the bug with Mario and Zero Suit Samus. I will put the replay as a attachment.

In the most recent dowloadable version( 0.9.1.1981 ), I was practicing the controls against a Level 3 Goku on Silph Co. with Hazards turned off. When the elevator platform was there, Goku would dash back and forth in the middle. Thought I'd report it.

EDIT: here is a low-quality GIF. http://gyazo.com/170e12a1e889ef6cb607a3e55707c801

I somehow went to sudden death against sand bag on online

Oh my goodness it's almost like that hasnt been reported at least a thousand times before.
Anyways, Missingno seems to appear a tad too often. not exactly a bug, but mentioning anyways.
EDIT: also, I tried turning off all random stages except Battlefield and FD. only FD ever worked.

In turbo mode, when Landmaster rams on someone and cancel it with a jump afterwards , Landmaster "transforms" back into Fox.

Another thing with Link's bombs from bomb arrow is that when they make contact with the ground, the explosion has a lasting hitbox which is longer than it should be.

Chibi-Robo can pocket Ness's PK Thunder or so I've heard, and he can recover with it when he does.