Thanks guys. The taxi droid is actually K.I.T.T. from Knight Rider (not sure how easy it is to make that out). I was looking from him to say something alittle more recognizable, but just tossed that in at the last second. Adding the droid smoke took only about an hour.
About the Jango clip. I'm pretty sure that was a green screen. If thats the case, thats a very easy background replacement. All the hard part is taken care of by the green screen.