Besides the House Juju thing which is probably going to be resolved soon, are there any major time loops that still have a piece missing and/or are incomplete?

There’s the white frog in our banner, we don’t know who sent that.

We also don’t know who put the weapons in the lotus pod that Jake gave to Liv Tyler. Following in that, we don’t have the full timeline of the Warhammer of Zillyhoo.