Continuity mistake: "Escape from Venice": Nelson takes the captured assassin's knife and says that Alicia was killed with one just like it. But he can't possibly know that. He never saw the body or the weapon. Only Crane was with Alicia when she was murdered, and Crane, still missing in action, hasn't been in contact with Nelson.
Continuity mistake: "The Cyborg": At the end, Crane shoots the cyborg Nelson in the forehead. It clutches at its completely intact face and falls down. We cut to crew reactions and then back to the fallen cyborg - and now its head is nothing but a jumble of circuits. Were those delayed-action bullets in Crane's gun?
Continuity mistake: "11 Days to Zero": A saboteur on an overhead scaffold hastily sprays an X on the top of Nelson's car with white paint. In later aerial shots, the X is composed of 2 perfectly straight, thick lines stretching from corner to corner of the car's roof. No way was that X made in a few seconds with a spray can.
Continuity mistake: Throughout seasons 2-4: When the series went to color in the second season, the Seaview was redesigned with only one set of observation windows. But stock footage of the old multiple windows continued to appear for the rest of the series, usually with the film dyed blue.
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