When Lisa rushes up the stair with her robot, after Homer gave it beer, the picture frames disappear from the back wall and the ramp is missing.
Lisa claims that she has no friends, but Janey and Allison have been established as her best friends in past episodes.
When Lisa runs into Marge outside Moe's, Marge claims she stole the car from McBain. She actually stole the car from Rainier Wolfcastle. McBain is a character Rainier Wolfcastle plays on the screen.