In one of the courtroom scenes, Stewie is missing his overalls.
When Brian is smacking Peter in the head with the newspaper, it clearly reads "Daily Informant". Afterwards, as they talk, it reads "Daily Times". The paper also changes position; the word "Daily" sometimes faces Brian and sometimes not.
When Peter is being questioned by the judge, a microphone in front of him is shown in some scenes, but in others, there is no microphone.
When Peter is having ice cream in a flash back, his eyes constantly change size.
Throughout the episode, Lois' shirt varies from having clear/dark/no buttons - often within the same scene - with the number of buttons also being inconsistent. Similarly, at one point, Peter has no buttons on his shirt.
When Lois is reminding Peter about all his drunk times, just before she mentions Peter getting drunk off church wine, his eye overlaps with his nose.
Quagmire is present at Peter's trial, but in several shots his face is drawn incorrectly.
When everyone is drinking at the stag party whilst watching Assablanca, the TV isn't even plugged in.
When Brian enters the kitchen with the newspaper, the name of the paper reads "Daily Informant". But, as the scene progresses, the name changes to "Daily Times".
Peter's shirt, throughout the entire series, is buttoned on the girl's side - right over left.
The mote around the house keeps people out, but the mail carrier magically appears on the inside of the mote to hand Lois the mail.