11/01/2012 12:32 pm ET

'30 Rock' Star Jack McBrayer On The Problems Working With 'Breaking Bad' Star Bryan Cranston

Jack McBrayer had a few problems when it came to working with Bryan Cranston on "30 Rock." In an interview with Vulture, the "30 Rock" star said he couldn't keep it together when doing scenes with Cranston, who was playing Kenneth's stepdad Ron, and Catherine O'Hara, who was playing Kenneth's mother.

"[Cranston] is the best, and the scenes we did together, I was dying. I messed up a lot of takes, because I just kept laughing. I was laughing in their faces. And I was so starstruck," McBrayer said.

But his biggest problem? McBrayer said he's not caught up on "Breaking Bad." At all.

"I have seasons one, two, and three on DVD, so I was mortified, because I didn't want to ask any questions, but everyone else was coming up and asking questions, so I had to [puts fingers in his ears and starts singing] tra la la la la! Because all the crew was caught up, and I wasn't," McBrayer said.

To avoid spoilers and give off the impression that he knew all about "Breaking Bad," McBrayer said he kept all of his questions "sort of innocuous."

"'How do you like your Starbucks?' 'So, where do you live?' Like Being a Person 101," he said.

"30 Rock" is coming to an end in January after seven seasons. Series creator and star Tina Fey told The Huffington Post in early October that she was still unsure of what the final scenes of the show would be.

"We started having a conversation of what we wanted our final images to be," Fey told The Huffington Post on the red carpet of the "30 Rock" Season 7 premiere party. "It got really emotional, so we kind of backed off it. Then we said -- every day at lunch our writers take a little break and watch a TV show and most times it's 'Honey Boo Boo' or 'Breaking Amish' and I was like, 'Guys, maybe we should start watching some classic TV finales.'"

Click over to Vulture to read the complete interview with Jack McBrayer.

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