It's a rule in the CBA, I'm almost convinced of it. Something like Subsection 48.2, clause RW-G. "All goals scored while physically on top of the Red Wings goalie shall be counted, without possibility of review."
How did that goal even count? Lupul hit Howard in the crease and then sat on him. That's allowed?... We get goals called back by only hitting a goalie in the pads with the stick.
On an interesting side note, Subsection 48.3, clause TH says "If Tomas Holmstrom is even in the same building as the game being played, regardless of his status or availability to play in said game, any goal scored by the Red Wings can be waived off as Incidental Contact with the goalie. A penalty can be imposed, solely at the discretion of the referee...
...and Gary Bettman."