VERY MILD MFK2 SPOILERS:
I can't believe it took me this long to notice, but the scar on the left side of Lino's torso completely disappears in MFK2:
The one he got from being bitten by Taz. This one:
Where'd it go?
I know that Lino is half-Macho and has some kind of healing factor, and that several years have passed between MFKZ and MFK2, but that's a scar he's had since childhood. A very big one at that. I find it hard to believe it would just disappear on its own.
EDIT: Oh, nevermind. I just checked Mutafukaz 1, and it seems like RUN just forgets to draw it sometimes...













