Sackboy's lvl 3, in older builds of the game, used to kill someone in the bubble by running into them, and then they respawn outside of their bubbles. I found this out by watching Sackboys trailer.
Also, Emmet's Rifle lvl 1 used to fire a blu projectile, not yellow. Also, in the trailer, he setup into his shotgun lvl 1.
Spike also set up into his lvl 1 in his trailer.
Nariko's square atack during her lvl 3 used to take much longer to execute.
Jak's down triangle used to have a longer horizontal range.
Sweet Tooths attacks used to cancel into each other.
FP's lvl 3 used to be much easier to dodge, and her lvl 2 stuned enemies closer (from what I saw)
Sweet Tooth could also have 3 mines out at once.
yea not OP at all. Annoying to lose in the last 5 seconds of the game when that cake spamming sack finally hit lvl 3 yes, but not OP