Okay, I know I am 20+ years late on this, but I couldn't get it out of my mind this morning. I don't know how much Slade spent on this video, but it's pretty safe to assume that if the weird facial and tongue contortions made it into the final cut, it wasn't a whole hell of a lot.
BTW, I woke up with this running through my head this morning. I think it has something to do with detox after watching that horrendous M. Night movie "The Happening" last night. Not even Rifftrax could save it from its "horrible-ability".