Yep, here are some pics of it. The episode is "Ultimate Mythbuster" during the part where they're testing out different "fear factors," and you can see a scale model of the RX8 when they're holding tarantulas. Adam's talking and you can see it behind him.

Attached are two pictures, almost one after the other in the episode, showing the 8. Sorry for the crappy quality, it's off of a YouTube video that didn't have any higher quality option(s).

 

I'm not sure if anyone mentioned this, but in X-Men 2 there was a blue Rx8.

One of the nicest Rx8's ever, and that's probably the main reason I wanted the rx8.
I fell in love with the car when I saw it, besides the concept models back in 01.

http://www.youtube.com/watch?v=tlG5bKnXII0

 

The orange/black car in Tokyo Drift was an RX7 and the Blue was an 8 =)

 

Macross Frontier the movie (UGH).

 

A guy got murdered in an American PBS Masterpiece Theater episode of (modern-day) Sherlock Holmes shown a couple of weeks ago.

 

My car is in a lincolntech commercial, can we add that to the list?

 

The EU version of the Series I is featured in Episode 4 Season 1 of Who is Erin Carter Series on Netflix. The lead actress playing Erin proves her driving skills in the RX8.