When Peter and Chris are recording the first episode of "Handiquacks", Joe is the one who says that their hands are slippery because of the new wooden stove that they just bought. In the episode that Peter shows to Fox, Quagmire is the one who says this line.
At the breakfast table when Meg and Chris are talking Lois into becoming a reporter, at first they each have juice glasses in front of them, then they disappear.
When Peter, Meg, and Chris are brainstorming the first episode of their show, the couch is 45 degrees to the walls; when Meg is left alone on the couch, it's now parallel/perpendicular with the walls.
When the exec is showing Lois around the studio, the Control Room door is open, yet the lettering would be backwards when closed.
In the bar, when Peter shows his driver's license to brag that he took the new photo drunk, the expiration date on his license is 11-11-2011. Cleveland then says "....I just got my new license a month ago", but the expiration date on his license is also 11-11-2011.