When Peter and Lois are at the KISS concert, for approximately one second when Peter Criss is in frame, he has blond hair. Then in the next shot he has black hair again.
When Stewie points toward the plane window the plane is still on the runway, but in the next shot it is already several feet in the air.
Just after the candy tree starts talking, the little girl it eats appears out of nowhere on the right side of the screen.
Lois doesn't recognize Gene Simmons with his Kiss makeup on, but when she sees him without his makeup, she recognizes him as an old friend and calls him Chaim. Although Chaim Witz was indeed Gene Simmons' birth name, he changed it when he was a boy to Eugene Klein (later Gene Klein, and finally Gene Simmons). Most likely, Lois was not even born when Simmons went by the name Chaim Witz, and would only have known him by a later name, especially when she was old enough to have slept with him, as she claims to have done.