General observations in point form:
- alt-Martha from S2 finale is actually future-alt-Martha; she drops Jonas off, them he finds the present-time akt- Martha in school
- the Nielsens live in the Kahnwald house (and vice versa?)
- Ulrich left Katarina for pregnant Hannah but still can't say "I love you", plus he's cheating on her with Charlotte (but Hannah suspects Katarina)
- Ulrich is the chief of police
- Woller has both eyes but missing his left arm (and probably knows about Ulrich/Charlotte)
- Erik is still missing but not he has a brother, Killian, was involved with Martha
- Helge's ear is fine but it's his left eye now that's gone
- Charlotte has a past with Aleksander
- Jonas is a little slow figuring things out
- Franziska is mute instead of her sister (who has aged visibly, desire the text that we've gone back to 2019)
- Regina has died earlier in the year
- Bartosz looks like he's pinning for someone, but is it Martha or Killian?
- Mikkel is not with Scooby and the gang as they go late at night to explore the cave, looking for clues as to Erik's disappearance the police may have missed; yes, middle of the night
- who was that, covered in the black goo that Martha saw in the forest? I couldn't tell
- soJso "Stranger" Jonas went to 1888 (is he calling himself Tannhaus or just renting space at the Tannhaus factory?); guess he does become Adam after all
- older Jonas is still a little slow on the uptake (how?!)