How can I get different endings?

Hint 1 of 10:

Yes, there is.

Hint 2 of 10:

First off, once you show Baxter and Dunbar the evidence, don't arrest them.

Hint 3 of 10:

Try arresting them separately.

Hint 4 of 10:

Or, wait a little bit.

Hint 5 of 10:

After a certain time, go to Ms. Dunbar's room.