Jane has a large gap between her front teeth (shared by the actress), which is uncommon in modern times due to orthodontics, but much more common in the 1600s, when Jane is from.
Despite Tommy making a deal with Jane that if he suffered everything she did she'd let Austin live, Jane still kills Austin in the end. One could chalk this up to her killing him because she can, but if one watches they'll see that Tommy asks Austin to kill him while he is suffering, which Austin obliges by stabbing his father with a scalpel. This is why Jane still kills Austin, because Tommy broke the deal. He didn't suffer the way she did, so she had no reason to spare Austin.
When Tommy is about to cut Jane open. In that exact moment, the radio starts to play by itself and we first hear some screaming. One is clearly feminine. Jane is not truly dead and can feel what is happening. Those were her screams as she knew what was about to happen to her and, despite her powers, could not stop it.
Early into the examination it's determined that there is internal damage in the vaginal region, which is a factor in the Tildens initially believing she is a sex trafficking victim. After The Reveal this is never explained, which implies some pretty darkthings happened either before or during her torture.
