Continuity mistake: When Peter is about to walk into the Drunken Clam, his seeing-eye dog refuses to go inside, so he puts the leash on a homeless man, thinking it was a fire hydrant. We actually see a fire hydrant in front of the homeless man, but then when Peter ties the dog up, it's gone.
Continuity mistake: When Peter and Brian are entering the Channel 5 Studio, we see a far view of Tom and Diane eating. The torn right sleeve (close to her hand) from the far shot shows that it reaches her elbow. In the close up shot, the sleeve doesn't go to her elbow. (00:09:20)
Continuity mistake: When Franz Gutentag falls off the step towards the end of the episode, Herbert is on the porch of the house and reaches out to him. When we see the shot of Gutentag falling in slow motion and the birds fly away, there is no sign of Herbert on the porch.
Continuity mistake: When Peter, Joe and Quagmire are watching Superman, they are first shown with three glasses on the table, one for each. After the scene of Superman is played on the TV, there are suddenly five glasses on the table. (00:03:30)
Continuity mistake: When Peter is eating dinner with Lois and her parents, on his plate there is mashed potatoes and meat loaf. Peter shovels potatoes in his mouth then spits them out all over the table. When his plate is shown again, the meat loaf has disappeared from the plate even though he didn't touch it.