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Jon Hamm, Tracy Morgan, 30 Rock

Dana Edelson/NBC

With its two live broadcasts last night, 30 Rock pretty much, well, rocked.

And while both East and West Coast versions involved plenty of surprise guest stars, one in particular was quite possibly the most memorable—Jon Hamm.

During a flashback parody designed to point out NBC's historic live programming of the past, the Mad Men star donned blackface to appear opposite Tracy Morgan in a spoof of Amos 'n' Andy.

But that wasn't the only moment of the live shows that will no doubt keep living thanks to the good old Internet...

Paul McCartney, 30 Rock

Dana Edelson/NBC

1. Different Folks for Different Coasts: Viewers watching in the East got to see Paul McCartney make use of Jack Donaghy's (Alec Baldwin) bathroom, while those over by the Pacific were treated to Kim Kardashian instead.

Will Forte, Jane Krakowski, 30 Rock

Dana Edelson/NBC

2. Mad About Mad Men: In addition to utilizing Hamm (who also appeared as a newscaster in another scene, portrayed by Brian Williams on the west coast), the song "Zou Bisou Bisou," recently featured on the AMC drama, was used during Paul's (Will Forte) proposal to Jenna Maroney (Jane Krakowski).

Donald Glover, 30 Rock

Dana Edelson/NBC

3. Younger Demo: Ever wondered what Jack Donaghy, Liz Lemon and Tracy Jordan looked like back in the day? Jimmy Fallon, Amy Poehler and Donald Glover gladly showed us.

Cheyenne Jackson, 30 Rock

Dana Edelson/NBC

4. Music to Our Ears: With Krakowski singing during the first live broadcast of the evening, followed by Cheyenne Jackson filling in for the second, it was a win-win for everyone watching.

Tina Fey, Alec Baldwin, 30 Rock

Dana Edelson/NBC

5. To the Moon: In a send-up of The Honeymooners, Baldwin and Tina Fey reminded us that their great comedic timing is right up there with Jackie Gleason and Audrey Meadows.

(E! and NBC are both part of the NBCUniversal family.)