Bingowings said:

As a nod to the ridiculous inclusion of ETs species in the senate for TPM why not have some ET ships at the landing site and ET at the Separatist's board room meeting?

When they all deliver their little declarations of allegiance ET's head could pop up and scream (from the scene when Gertie runs into the room and they both scream at each other).

Similarly the EEV Pod in Watto's yard could result in a monolith from 2001 being one of the Separatists too.

I had an idea along the same lines. Continuing the Superfriends gag from TRM, have some of the Legion of Doom sitting around the table. ;)

I also thought Watto could ask Ani about getting him a pizza, (in place of beating up the people who owe him money) as he's still waiting for one to be delivered.