Other mistake: The Doctor scrubs his hands before an operation. He should not have to do this. He is a hologram. He could just dematerialize himself and be rematerialized if he's concerned about contamination.
Suggested correction: Maybe dematerializing and rematerializing would waste too much energy.
Other mistake: Throughout the whole show there are several shots of submarines, aircraft carrier landings, chopper flights that are exactly the same in different episodes.
The Debt (2) - S3-E7
Other mistake: At the end when it shows that Xena did kill the "green dragon", you can see his eyes move when the camera pans around his face to show the hair clip in his temple.
Other mistake: Callisto's sword is missing. She's the Warrior Queen, so she should have her sword. When Callisto appears in the Xena Season Two episode "A Necessary Evil", her sword has reappeared when Xena frees her from the Labyrinth of the Gods for her help with defeating Velasca.