Originally, the third act was going to be about Homer taking his daycare charges on the set of Ron Howard's new movie, and Homer endangering the children to the point that they don't trust him anymore. Ron Howard didn't appear for any recording sessions, so the entire third act was scrapped and replaced with Homer winning a Good Guy Award, and Bart and Lisa showing video footage of Homer being an unfit father.
The scene of Homer's scab healing over Ralph's hand has been described by fans one of the worst moments in the show.
It is revealed that Carl is African-American
When Sara is seen among the kids playing tug-of-war with Homer (who's actually using his car to pull the other end of the rope), at one point, she isn't wearing pants.
During Homer's morphine-induced hallucination, the moon says, "You go, Homer!" The closed captioning has the moon's line as "Crateriffic!"
In the initial airing after Milhouse says that Homer thinks Bart's jacket looks better on him, there is a brief shot of Bart drawn as if the show was done as an animatic. All reruns (including the season 12 DVD set) has this mistake corrected.