After Horrocks is stabbed by Ian you see him fall twice and the second time it is obviously a dummy.
When Jenny is giving birth and Claire is assisting she is not wearing her gold wedding ring on her left hand.
When Claire is nursing the baby on the steps while waiting the return of Jamie and Ian Claire has her gold wedding ring on her left hand but when she hands the baby to Jenny it is missing. Then when Jenny hands her the bracelets it reappears.
It seems everyone in the 1740s had perfectly straight and perfectly white teeth, even the brigands and highwaymen. Also the main characters' clothing was always clean and their hair freshly shampooed.