With all that's been said about the allegations against Woody Allen, this ruling by the judge against Allen is the place to start.

It is very detailed and extensive and settles many factual "questions" that the media haven't covered well.

In short, Allen was already in therapy for acting inappropriately towards Dylan. The therapist who was apparently more on Allen's side found him fairly obsessed with her (I believe before the relationship with Soon-Yi even came out) although she says she didn't see it as "sexual." Obviously she'd be motivated not to see that, given who he was and that at that time there weren't accusations of actual abuse against him.

Links:

https://www.scribd.com/document/205403621/Allen-v-Farrow-Custody-Ruling-June-7-1993

https://www.huffingtonpost.com/danny-shea/heres-the-1993-woody-alle_b_4746866.html