Continuity mistake: BB-8 and Rey watch the Nightwatcher Worm go away after she feeds it and you can see BB-8 with the slime on him. It cuts to a different angle just before the droid asks her how she found him, and the slime spots on the side of his head change shape and size.Most notably the middle spot shrinks significantly and the bottom one over laps the edge of his head. (00:02:25)
Other mistake: You don't have to look further than the name; the title of the series is "Knight's and Magic" instead of "Knights and Magic".