Are there any existing/hisorical complete sets (for example: buildings, vehicles, etc) featured in The Lego Movie? Sets created specifically for the movie do not count. For example, the bad cop's grandparent's house looks awfully familiar but I couldn't place whether that is an exact set that already exists, or just in the style of some of the older vacation/holiday house sets.
The Toa Mata from BIONICLE briefly appear in the film when Wyldstyle is talking to Emmet about the prophecy. So do Fabuland, 9448 Samurai Mech from Ninjago, 3189 Heartlake Stables from Friends, 8158 Speed Racer & Snake Oiler from Speed Racer, along with a few other themes. Some stopmotion videos created by fans on ReBrick were featured in the movie.
The car Emmet drives at the beginning of the movie is a slightly modified version of the 3177 Small Car.
Yes! Well, it depends... When you say featured, do you mean "it appears in the movie" or "it plays a central role in the movie"? If the former, many of them appear in "real life" scenes of the basement.