Continuity: When Brian is putting in his eyedrops, notice his buckle on his collar. In the next shot, we see Brian's reflection in the mirror, but the buckle is not flipped.
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Quotes
[Joe Swanson is hanging on the edge of a waterfall in a sewer and Lois is trying to pull him up.]
Lois Griffin: Joe, I can't hold you! You're too heavy!
Joe Swanson: Lois! Pretend I'm one of your children!
[Lois begins to let go of his hand.]
Joe Swanson: Not Meg! Not Meg!
Trivia
In the clip "Larry and Steve", Larry mentions a store called Stewie's. See more...
Family Guy (1999) - 2 mistakes in "Brian: Portrait of a Dog"
Directed by Seth MacFarlane, starring Seth MacFarlane, Alex Borstein, Lacey Chabert, Mila Kunis, Seth Green (add more)
Updates: 
Series 5
Brian: Portrait of a Dog (season 1, episode 7)
Continuity: On Peter's letter to MacGuyver, the return address is '725 Spooner St.', but in other episodes, Peter lives at 31 Spooner St.
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