Free for All - S1-E4
Continuity mistake: Throughout the episode, Number 6's lapels switch from having solid to broken white piping and back again.
Continuity mistake: David and Kathy exit to the outside of the building, closing the inside door and the outer door. When Sheriff Carver exits to the outside, the inner door is not closed, but open as he steps out.
Continuity mistake: At the very end of the episode, where Captain Scarlet, Captain Blue and Lieutenant Green are about to enter the airlock, their recognition badges are gone. Once they are inside the XK3 rocket, the badges have returned.