In the kitchen, when Meg introduces Jennifer, her glasses disappear then reappear a moment later.
When Brian moves chairs to listen to Peter's explanation, he discards his 'DOGGY STYLE' magazine. However, when he returns, the magazine has changed colors to red. A few moments later, it has vanished completely.
When Stewie is making his diary while in his bed, the first time he is seen, he is wearing his normal red and yellow clothes. However, in the next shot he is in his pale blue pajamas.
Peter's watch which he lost at the beginning of the episode randomly reappears and disappears from his wrists throughout the episode.
In the flashback as Lois is making the cake of Meg's first birthday party, when Peter appears the cake changes color.