I Was on IMDB.com aka Internet Movie Database the very reliable Internet Movie Fact/News Site and it said under Transformers Revenge Of The Fallen Trivia Page These Things. The Autobot Hound, who transforms into a military Jeep Wrangler, will be featured in this film on special request from the United States Military. They noted that in the first film most of the military vehicles were used for the evil Decepticons, so now they asked that some of them be good guys. The Autobot Arcee was originally meant to appear in the first film, but was replaced with Ironhide since the writers thought the issue of robot gender a difficult one to explain. Afterwards they thought it could just be ignored and have Arcee in the film to please her fans. A Pontiac Solstice sportscar was spotted on the set during filming. This car was the alternate mode of the Autobot Jazz, who appeared in the first film. Also Confirming some things we already know... The Decepticon Soundwave, who appears in this film, was originally meant to appear in the first film but could not be properly reworked (he was a helicopter but that was rewritten as Blackout, so he became a radio but was rewritten as his minion Frenzy). His alternate mode in this film is a satellite. During production, Michael Bay attempted to create a misinformation campaign to increase debate over what Transformers would be appearing in the film, as well as to try to throw fans off from the story of the film. However, Roberto Orci confessed it had generally not been working. The Link Where I Got This Information is Transformers: Revenge of the Fallen (2009) - Trivia I Usually Trust IMDB For They Get Their Info From Studios and People working on the Movies and They Confirm Their Sources. I Just Noticed This and Wanted To Share This With Everyone If Somebody Shared This Before or It's Not Considered News I'm Sorry But I Wanted You All To Know and I'm Excited for Jazz and Hound!