When you watch your favorite shows, oftentimes you don't realize all the tiny set details that the decorators work so hard to think of, so it feels like a real person's home. But, whenever hidden easter eggs are shown, it completely blows your mind.

As CBS revealed on their website, The Big Bang Theory, one of the network's big hits, is packed with clever easter eggs tying the show to reality, including a hidden detail about Penny's (Kaley Cuoco) former apartment.

Since "Penny is very girlie," set decorator Ann Shea told CBS, she wanted to bring bright colors into the walls and furnishings. Since she couldn't paint the walls, she went with colorful furniture and accessories to create a "fresh-looking palette," focusing on hues of turquoise, orange, purple, and lime. But that's not all she did to make it personal.

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Here's what the kitchen looked like when Penny lived there:

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Let's zero in on her refrigerator. If you look closely at the photos tacked up on the fridge, you'll see that they are all real photos of Kaley Cuoco with The Big Bang Theory cast and crew.

Take a closer look:

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Some of the people you can spot in the pictures are Amy (Mayim Bialik), Bernadette (Melissa Rauch), and of course, Leonard (Johnny Galecki).

Now that Sheldon (Jim Parsons) and Amy live there, things have clearly changed.

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But some photos did make their way across the hall to Penny's new place.

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Fascinating!