After Karen gives Lois a Pez at the Griffin's front door the actual front door has disappeared.
When Lois looks at the pills (wearing blue eyeliner) in the bathroom of the Clam, the shot focuses on her face, and her blue eyeliner has disappeared; the eyeliner returns when the shots zooms back out.
When the Evil Monkey pulls out to the Foghat record, he listens to the song Slow Ride. This song is on the Fool for the City LP, which has a blue cover with a man fishing in a manhole. The record the Evil Monkey has is one with a generic white sleeve, not Fool for the City.