Scouts Out! Cavalry Ho!
Spot on. The negative [or electronic image thereof] has been *flopped.*
Also on the subject of Shermans in movies, if you ever happen to watch the first/original Blues Brother's movie, when the Illinois National Guard pulls up to the Richard Dailey Building you may note that as one Sherman traverses and elevates its main gun toward the building, the elevation is a little jerky. We were missing one of the counterweights for the main gun stabilizer, and didn't have time to rig lead weights for a substitute. Anyway, nobody was shootin' at us.