The Séance - S1-E7
Continuity mistake: After Lucy tells Mr. Merriweather that he's invited to the seance, when it cuts to Lucy unfolding the card table legs, note the couch behind her with one normal seat cushion on the left, but in the next wideshot there's an additional shorter cushion under the normal cushion. The small towel also repositions itself neatly on the couch. (00:11:55)
The Kid from Silver City - S3-E10
Continuity mistake: Roy is visited by a deputy marshal who is looking for the son of a local storekeeper. When the two men leave to visit the storekeeper, Roy leaves his hat on the kitchen table, but when he enters the store the hat is on his head.