Not the worst collab out there... but...
What really loses points for me is all the SMBZ references. Surely there are other sound effects you could have used? Other than that, really only liljoeys and HyperGumba's parts stood out to me as being any good. The rest were very cliche' or unfunny (such as the "Weegee joke") x__x.
Also, try to make the punchline a little something different than "character walks in, WHAT THE FU- *BOOM*". Lots of these skits ended like that and it got really stale. Hopefully you give this some thought if you go to make a 3rd one. D: