Made in Disneyland
The Cinderella Castles at DisneyLand and DisneyWorld were based on French and German Castles built long after the Medieval period. King Arthur was supposed to have lived in the Dark Ages, before stone castles were built, but let us not worry about that little detail as most of us are happy with the fantasy legend.
Unfortunately, the use of the unrealistic castles and towns, Star Trek costumes and bad acting gave the film the cheesy look of the Republic Serials with added color, and what color! Blue, bright strong blue everywhere - like a Best Buy store. The film would have worked better as a comedy where the crew of the Starship Enterprise flew boldly into a time warp and arrived in Camelot with Q playing the bad guy. Or have they already done that?