Continuity mistake: During the big swordfight with Ravenhurst at the end, Hawkins gets cornered by a row of candles. To show off, Ravenhurst slices through a candle near himself. Hawkins slices through the row to one-up him, and at first appears not to have cut them. Ravenhurst laughs, and then Hawkins blows at the candles, and they all fall apart, the cut bases angling downwards away from Hawkins. There's a shot of Ravenhurst being insulted, but then watch the candles in the next shot of Hawkins - the angled bases of the candles are all now *facing* him. A few of the cut-off pieces also reappear on the tabletop.
Revealing mistake: During the "Outfox the Fox" number when Hawkins "cuts" the copies of himself in half, the copies are obviously all grown men, which then obviously become little people standing on each others' shoulders; it's easy to tell where the cloak hems of the little people on top end.
Continuity mistake: When King Roderick's men ask Hawkins and Maid Jean if they've seen the Black Fox's men in the forest, Hawkins has his hat in both hands in front of him. When the shot cuts, he now has one hand, gripping the hat, wrapped around Jean, and the other down by his side. Jean's hand also jumps from Hawkins' wrist to his chest between the two shots.