Eh, I don't think they were trying to replicate that specific scene just the "movie trope" of an RPG exploding causing a heavy vehicle to flip. The clip they used was probably the "best" they could get to demonstrate the idea without resorting to the animations. Afterall, they never mentioned FF6 when setting up the "myth" just mentioned the movie trope of vehicles flipping when hit (or near) an exploding RPG.
But, I agree, there's plenty of times the Jr. team makes little errors like this. I've not watched the Aftershow for the episode maybe their reasoning is addressed there?