http://www.looper.com/7496/hidden-things-missed-big-bang-theory/

Not only is The Big Bang Theory one of TV’s most popular shows, it’s also full of fun easter eggs and tidbits for the fans to discover. The main characters on the show are all geniuses who happen to also be giant geeks, and the show’s producers have really embraced nerd culture. There are constant references to comics and science fiction thrown into show. Some of these are obvious, but others are a little harder to notice.

Read More: http://www.looper.com/7496/hidden-things-missed-big-bang-theory/?utm_campaign=clip

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Sheldon's t-shirts - the color represents what mood he is in

The clothing - they always wear the same things, like in a cartoon

Apartment numbers - everyone in lives in a house or apartment with a coincidentally important number (substantiated with 2 examples)

Bernadette's voice changed - in the first episode it wasn't so high-pitched

Sheldon's favorite number is 73, for obvious reasons

Howard's toys - all the action figures in his room are female because he's a perv

Opposites attract - Leonard and Penny (not really hidden)

Penny's last name - unknown and producers have said that it won't be revealed, but it's Barrington.