Continuity mistake: Peter says "Oh crap" as soon as he realises Ernie the Giant Chicken is looking at him in the window. When the camera pans over to Ernie, he is standing an inch away from the glass. It then cuts to a wide angle where Ernie jumps through the window, and he has instantly moved back a few inches.
Continuity mistake: When they notice Muriel has disappeared, everyone runs back up the secret passage. As they run out the room, the order of the guests are: Peter, Diane, Chris, Lois, Carl, Doctor Hartman, Meg, Jillian, Brian, Quagmire, Mort, Derek, Seamus and Mayor West is way at the back. Yet as they run through the passage the order is: Peter, Lois, Tom, Quagmire, Diane, Chris, etc. But as they come out of the passage, the order is: Peter, Lois, Tom, Diane, Chris, Bonnie, Meg, Quagmire, Carl, Mayor West, Doctor Hartman, Mort, Seamus and Jillian is way at the back and not Mayor West since he was last seen exiting the secret room. Also Derek nor Consuela were seen in the room just as they ran out, yet when they magically appear when they are doing the groups.
Continuity mistake: When James returns to the lounge to find everyone there, they all accuse him of killing Stephanie, so they walk over to the dining room with James at the front followed by Tom and Priscilla behind him and Joe and Doctor Hartman behind them. But when they enter the dining room, Tom and Priscilla are no where to be seen and it is now Joe who is behind him. Also in that same scene, several other characters change position. The people who are in the room are Peter, Chris, Brian, Quagmire, Joe, Bonnie, Diane, Doctor Hartman and Seamus and the rest of the guests aren't seen. So when they enter, Diane and Chris are at the back followed by Seamus, Quagmire and Bonnie in front of them, followed by Doctor Hartman, Peter and Joe at the front. There is then a shot of the chair completely empty. Yet in the next shot, Brian has suddenly appeared next to Joe out of nowhere. Then in the following shot, Diane is still at the back but now more closer to Bonnie and both Bonnie and Quagmire have changed positions and Seamus is now at the back and Chris is suddenly next to Quagmire at the edge of the right hand side of the screen and Peter is now behind Joe. Then the shot cuts to James and the shot cuts back to guests. But now Peter has appeared next to Doctor Hartman again and now in front of Joe and not behind him. Also Diane is now no longer at the back but in the middle towards the left of screen and no where Bonnie and Seamus is now partially in front Bonnie. Then when the shot cuts to James saying he is a member of MENSA and a huge hit with the ladies, there is no sign of Brian standing next to Joe. Then in the shot before the lights go out, Diane is now at least ten inches behind Bonnie and Lois has appeared behind Seamus out of nowhere. Then by the time the lights go back on again, Lois is now in front of Joe and all the other guests have appeared in the dining room. Then when Seamus says "Look", there's no one in front of him even though loads of other people were there in front of him before the lights went out. Then the shot zooms out and we can see in the shot are Doctor Hartman, Priscilla, Joe, Brian, Carl, Mort and Tom. Then when Joe says "Nobody touch the knife", it's now Seamus, Bonnie, Quagmire, Lois and Derek in the shot. Then when we see Peter and Chris in the shot, the shot zooms were Joe appears we can see Quagmire, Lois and Bonnie behind Peter even though they were way in front of them a couple of seconds ago. No way could they have all moved that fast, not with all the other people in the way.
Continuity mistake: Near the end of the episode, Joe and Quagmire are shown sitting at a booth inside the bar with Joe pulled up to the corner of the booth. As Peter apologizes to them, Joe is no longer seen next to him. As Peter takes Quagmire's check, a part of Joe is seen sitting in the next booth. In the shot after, he disappears again for the rest of the scene.
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Continuity mistake: In the scene with the multiple versions of Stewie and Brian come back to 1999, one Peter is with one of them. When Stewie asks everyone to vote between 9/11, Peter is standing in the foreground, but disappears when one of the Stewies says Brian had his throat slit.