Did this influence Flash Gordon?
It seems highly improbable to me, but watching it last night I found myself reminded of the 1980 Flash Gordon movie in a few scenes.
Apart from Princess Elaine's witchy make-up reminding me of the naughty princess's scarlet get-up in FG, there's a scene that is strongly reminiscent of the bit in FG where Flash and Dale are allowed a few moments together - Pendragon even utters exactly the same line - "you have until the sands run out...", turning over an hourglass as he does.
There's also a moment where Pendragon turns himself into a dragon and the brief shot of him projecting himself into the sky looks a lot like the image of Ming that comes out of nowhere to zap the pilots in the first few minutes of FG.
These are tenuous similarities, so I'm not convinced of this, I just found a few moments very reminiscent...