Continuity mistake: After Lois says, "When Meg and Chris turned one I missed everything," it flashes back to Lois writing 'happy birthday Meg' on the cake, and there's wallpaper border at the top of the walls, but when Peter asks her what she's doing in the kitchen the wallpaper border is gone. The paper cups that Lois filled with punch also vanish, and the rolling pin, board, etc. suddenly appear.
Add timeSuper Grover
Continuity mistake: When Brian and Stewie arrive in Leonardo's atelier we know that they are in Florence for two reasons: because of history and because we see Palazzo Vecchio (which is in Piazza della Signoria, in Florence) outside the window. Then when Stewie and Bertram are fighting with Leonardo's flying machine the city of Florence is wrongly represented as if it was Venice, with the see, the lagoon and the canals.
Continuity mistake: When Brian stops at the Marriott, he orders a Jack on the rocks. As he is ordering it, there is a woman in the background with a martini, then when the camera cuts to behind the counter when Brian receives the Jack on the rocks, the same woman has red wine instead of a martini.
Continuity mistake: When the guests walk through the secret passage, the order of the guests change between shots. First, it's Peter, then Chris, then Carl, then Doctor Hartman, then Seamus, then Quagmire, then Lois. But in the shot of the passage, the order is Peter, then Chris, then Carl, then Lois, then Consuela, then Doctor Hartman. Then when they reach the secret room, the order is Peter, then Chris, then Carl, then Lois, then Bonnie, then Quagmire, then Derek, then Jillian.
Continuity mistake: Peter knocks out Joe during the search in the hallway. Yet when everyone is fighting about the motives, there is a wide shot of the fight but Joe can be seen fighting behind a couch with Doctor Hartman and Derek. He can't have regained consciousness, because he doesn't regain consciousness until later in the episode.