When Moe opens his new night club, Homer asks for a Duff beer. Moe says that they no longer serve Duff and instead shows Homer an Asian brand of beer and places it on the bar. When it cuts back to Moe, you can briefly see that the beer he placed on the bar says "Duff" on it.
At the very end, a close-up shows Homer dropping a bill into Moe's tip jar. There's an immediate cut to a wider shot and the jar is empty.
At the end, Homer is wearing his usual clothes, however in the last few seconds when he talks to and tips Moe, he's suddenly wearing a pink tie.