When does a film, obviously inspired by another, segue from being a homage to a blatant rip-off? If a story has a similar plot but some narrative changes, is it considered a variation on a theme...

I fondly remember the 1981 version of Clash of the Titans. Though it didn’t leave me as breathless as another film from that same summer, a little ditty called Raiders of the Lost Ark, it did pr...