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.
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.