Keb' Mo' who plays the letter writer "Gabe/The 52-80 Man" in Signed, Sealed, Delivered: Higher Ground (2017) also sing his song "Tell Everybody I Know" during the opening credits.
Cecilia Deacon's debut.
After the last movie the building was sold where they filmed the DLO and The Mailbox Grille. So Ramon opened a new restaurant which is now their go to place for a meal but it is never said why they no longer go to The Mailbox Grille. And there is a new office space for the DLO with the explanation that their old office was converted to an online shipping center. However the DLO has major changes in future movies, partially because of the long gap of time between filming, and nothing is ever said again about why the office keeps changing.