At the far right in 328 BC (Ancient Greece, 1 o'clock on the time device). You can get hints at where the missing items are located, but simply scouring the various times will provide more than enough items and clues.
The oracle is in the building on the hill on Time Tangled Island.
your mamma
inside a temple
No. She will only give you hints about one of the items, and the hardest to get (the golden vase) is her price for more information.
You don't have to. You go up the hill and your behind the wall.
you do not give the vase to the oracle you give it to the guards right where you come in
the oracle is in the second door .
the oracle is in the second door .
The golden vase in Time Tangled Island belongs to the Oracle on Greece. I do not know what time period it is, however.
You return the golden vase to the Treasury guards, not to the oracle. (see related question)
All you have to do is click on one of the guards after you got the golden vase from the vikings in the cave then you can talk to the oracle on the hill.
Time Tangled IslandIf you've already visited 328 B. C. in Ancient Greece and donated to the golden vase to the Oracle of Delphi, you could always return there and get hints from the Oracle to fix other eras that you've not solved yet.