When the Stooges come out from underneath their father's bed, Curly's hat is crooked, but is fixed in the next shot.
When the Stooges are defeated in a sword fight with the palace guards, the swords are scattered all over the floor, but in the next shot, as the Stooges are led away, the swords disappear without any explanation.
When Curly knocks out the guard in the hallway and lands upside down, his hat is nowhere to be seen.
During the wrestling sequence, Larry holds his head in pain after Curly elbows him, but in the next shot, his hands are on the ground.
When the Stooges salute the queen, Larry misses his cue and salutes too late.
When Curly goes over to one of the guards to snap his fingers at him, he accidentally slips and falls to the ground.
The officer in charge of the firing squad gives the order "Fix arrows." but all the soldiers are carrying crossbows. Ammunition for a crossbow is properly called a quarrel or bolt, and an officer would have known that. The correct order should have been; "Load weapons."
Though the short's title is Restless Knights, the Stooges' characters are actually musketeers.