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.
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)