The video service they all use is Gryzzl in keeping with the internet service Pawnee uses.
None of the actors actually interacted with each other. They were actually reacting to the writers and director reading the other characters' lines. With the exception of Ron and Tammy 2, since Nick Offerman and Megan Mullally were married in real life and living with each other.
Adam Scott thought Parks and Recreation was reunion-proof because of the particular brand of ending it had. However, fund raising to help people in a real-world pandemic prompted everyone to reunite one additional time 5 years before One Last Ride took place.
This episode was produced to raise money during the COVID-19 pandemic in 2020.