Here's a link to a lot of cool Three's A Crowd color photos. Some of which are behind the scenes shots.

https://www.gettyimages.com/photos/threes-a-crowd-john-ritter?assettype=image&phrase=three%27s%20a%20crowd%20john%20ritter&sort=mostpopular&license=rf%2Crm

Thanks for the great link.