Jackie Jr. pours himself some cereal and talks to Ralph. In the next scene, the cereal box has changed.
When Ralph is in the diner with the two other guys, his coffee cup changes from in his hand to on the table a couple times as the camera angle changes.
Paulie says that "some Hollywood producer also died in the bathroom. His name was Don something and he was a producer for the Simpsons". He's referring to Don Simpson who had a heart attack in the bathroom and died in 1996 but he didn't have anything to do with The Simpsons.