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		 One handicap that The Simpsons Movie suffers under, I'd say, is the fact that the TV show is still on the air, which must be horribly limiting (even in a TV show like The Simpsons where continuity isn't so important). 
 
One common approach to these TV-to-movie adaptations is to spoof the source material (The Brady Bunch, Car 54 Where are You?, McHale's Navy). Another is to re-envision an artifact of the past into the modern day  presentation (Charlie's Angels, S.W.A.T., The Mod Squad). A third would be to take the original as an inspiration and then just tell your own story (Maverick, The Addams Family, Mission: Impossible). 
 
For The Simpsons Movie they can't really make too much fun of themselves and there is no temporal separation to offer up a different perspective. And having to return to the small screen in the fall it would be difficult to truly and completely shake up the Simpsons universe. 
		
	
		
		
		
		
		
	
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