As Peter tells his rat story, Lois' earrings change from white to blue.
When Peter and Lois dance, Peter's pants are green, but were previously blue.
On Peter's Star Wars collectors glass, Yoda is brown. He's supposed to be green.
Mean Joe Greene tosses his jersey to Peter. The name on the back is Green, not Greene.
In the "Dirty Dancing" scene, the sign on the door reading "Resort Staff Only" misspelled the word as "Stafe" in several shots.
The song sang by the mansion household when the Griffins arrive deals with them becoming rich. However, they didn't inherit any money, so this is inaccurate.