Your question doesn't really make sense. Assuming you don't mean the sound control the show is aired and you mean the DVD volumes, there aren't any differences. Obviously they have different episodes in each volume but they all have commentaries, deleted scenes, a Behind the Scenes feature.
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it is my understanding that Stewie Kills Lois Pats 1 &2 are included in Family Guy Volume 6, which was released in October 2008. also, you can view episodes of Family Guy by visiting the FOX website & going to the Family GUY web page.
Family Guy is not released on DVD as seasons, it is released as volumes. Volume 7 (which is out now) includes season 7 part 1 and Volume 8 (comes out in 2010) will include the rest of season 7.
Joe Swanson is the wheelchair-bound paraplegic cop on Family Guy.
Walter Murphy & Ron Jones are the composers on Family Guy.
Mike Henry is the voice of Consuela on Family Guy.