Yup
one word to my german fellows: the song is performed by avenue q, who is known to play with stereo types ("if you were gay" is performed by them either). it's not meant to be offending, it's meant to be satirical and therfor funny. (and it really is!)
so the song is hilarious while your movie is not, because - as you said - you didn't put to much effort in it. a bit colouring would have worked wonders for it would allow you to identify the characters. (joey wears a red shirt, and so on) the other thing is, that you missed some puns. in the scene where they don't wait at the elevator for zoey for example, you could have put francis, bill and louis in it and made scenery look like the mercy hospital. that would have been a real reference.
and by the way: what's up with your spelling of the german word? in every scene it changes. it's: Schadenfreude! (even the song tells how you spell it!) so all in all, quite nice, but nothing special.