NBC has just released an uproariously hilarious dress rehearsal clip from last weekend’s “SNL” that never made it to air. In it, Maya Rudolph resurrects her famed over-the-top Oprah Winfrey impression during an appearance on Weekend Update. After watching the bit, in which “Oprah” offers up a handful of bizarre audience giveaways and pitches her new self-centric slate of OWN shows,  it’s obvious why Lorne Michaels decided to cut it from the live episode: Seth Meyers and Amy Poehler cannot stop cracking up. (PS: Is anyone else oddly intrigued by the concept for “Hawaii Five-Oprah?”)