Continuity mistake: A UFO crash lands in Canada and sits amidst trees in a wooded area. Just before the craft explodes, the only snow visible is on mountains in the distant background. After it explodes, however, the ground and trees all around it are suddenly covered with snow. (00:36:30)
Continuity mistake: When Straker grabs the gun from Foster, we can see a man in a spacesuit outside Moon Base's control room window. But in an establishing shot just before this, we saw an exterior shot of the base, including that window, and the spacesuited man was nowhere in sight. (00:30:00)
Continuity mistake: In the opening scenes, the smudges and rips in Straker's black shirt keep appearing, disappearing and changing configurations between shots as he races through S.H.A.D.O. HQ and the Harlington-Straker studio lot. (00:04:30)
The Cat with Ten Lives - S1-E3
Continuity mistake: Right after the "Immediate launch" on MoonBase, when it cuts to Miss Holland, she's walking from her office into Straker's office. The cat runs away from Holland, and in the cat's close-up, it exits Straker's office. However, this doorway is not leading to Miss Holland's office in this close-up. (00:41:20)
Continuity mistake: When the Apollo 8 space debris is shown, the print type of "USA" on its side changes between the long shots and closeups. (00:04:20)
The Cat with Ten Lives - S1-E3
Continuity mistake: When Ayshea finds the Siamese cat wandering around SHADO Control, in the close-up of Ayshea petting the cat, her fingernails are short; but otherwise, Ayshea has long fingernails. (00:29:45)
The Cat with Ten Lives - S1-E3
Continuity mistake: At Murial and Albert's, when the ouija alphabet cards are placed on the table, the "YES" card alternates being between the "G" and "H" cards or the "H" and "I" cards, depending on the camera angle. Other cards change direction/position as well. (00:13:40)
Continuity mistake: When Straker and Freeman arrive at Miss Ealand's office, there's a white jacket hanging on the red upright coat rack, but next shot as the doors to Straker's office open, the jacket has vanished. (00:40:55)