Mitchell (Theatrical version)
Mitchell was one of many movies where alternate version of many scenes were filmed, one for the theaters and one for TV. There were also many scenes that were cut out of the TV version. MST3K did the TV version. I would like to see RiffTrax take a shot at the theatrical version that featured Linda Evans writing "bastard" on the hero's car instead of "jerk" and included the hilarious death of John Saxon. It would be a revisiting of some classic moments along with quite a few new ones!
Rob S commented
There's also the scene where Mitchell catches up with the Mustang driver and beats the crap out of him, and the bit at the deli counter, where Mitchell drives over Benton's foot before going inside to harass Cummings some more. I'd love to see those parts get riffed.