Immediately after the opening credits Peter walks in with a box full of books, he puts them on the table the the camera cuts to Lois speaking when the camera cuts back to Peter the box is gone
When Brian walks into the kitchen he has no tail, however when he picks up the cheese puffs, his tail has returned.
In the "Kids Say" auditions, when the Griffins are waiting to go in, Peter is wearing a blue suit with a red tie. However, When the screen does a close up of Peter with Lois and Stewie, he's wearing a dark grey suit with black tie. When the executive picks the Griffins over Jake Tucker, Peter is wearing is usual white and green clothes.