Homer has a thought bubble about material posessions- a convertible, and a sweater. Suddenly, Buddha is wearing the sweater and driving the car. He says something like
“Give up your material possessions for true happiness.” police car sirens go off “I am not going to jail again!” speeds off :eek: 
Some folks are probably gonna be confused about this one, so:
He’s referring to a gag in a The Simpsons episode from last year, “'Tis the Fifteenth Season,” that was rerun tonight. Here’s a vintage thread on that episode. (WARNING: For historical purposes only. It’s okay to look into this thread to see what people thought about the episode when it originally aired, but the moderators frown upon posting new stuff in old threads. Look, but don’t touch.)
“Today is the birthday of Our Lord Jesus Christ…and singer Barbara Mandrell!”
I did see the episode tonight, and the first time it aired, but I’m not sure I understand the question. I don’t think the joke is that Buddha stole those things from Homer.