In "Little Griffins" when Peter and Quagmire are approaching Lois in the school playground, the shot changes from a high-angle to a medium, and Peter and Quagmire switch positions.
In "Super Griffins" when the Griffins enter the town meeting after Peter morphs into the dinosaur, you see a woman seated on his left side with red hair. After Peter demands the statue be erected, the same woman can be seen but in this shot she has brown hair.
In one segment, Peter wishes to have no bones, yet his head and hands are still mostly intact.