Is There a Doctor in the House? - S4-E18
Visible crew/equipment: After Tony and Roger help General Peterson to the couch to lie down, when they leave the office we can see the actors' tape marks on the floor beside the couch.
The Night of Miguelito's Revenge - S4-E12
Revealing mistake: At the beginning of the episode, as Jim West walks away from the newsstand vendor and closes the magazine, a 1967 ad for DieHard batteries ("The DieHard Fights the Common Cold") can be seen on the right-hand page of the prop magazine, in a modern sans serif font.
Visit to a Hostile Planet - S3-E2
Continuity mistake: When the guy shoots the Robinson Robot it leaves a big bullet hole on the front. In the next shot we see the Robinson Robot turning around and the bullet hole is gone.
Continuity mistake: When Max challenges the Shark to a game of pool, Max's hand holding his cigarette jumps to the tip of his pool cue, and a chalking cube appears in his hand from nowhere. (00:19:00)
Katokutai shutsugeki seyo - S1-E4
Visible crew/equipment: When Neronga is shown destroying the power station, one specific shot shows Neronga roaring while tilting its head upwards. In the next shot, two metal wires can be seen being connected on top of the head, possibly used for the previous Neronga's roaring shot. (00:19:24)