When Xena arrives at the bridge with Argo, she calls the horse "boy," even though it is established in future episodes that Argo is female.
When Xena is riding on Argo, right after Gabrielle gets a lift from the traveler, her sword and Chakram switch sides between shots. In the final shot, she doesn't even have either of them on her hip.
The introduction of "The Pinch". Xena stated Hector will die in 20 secs, however, for the rest of the series, she stated 30 secs instead.
Draco's men are armed with compound bows, a very modern weapon invented in 1966.