During the whole bar sequence at the beginning you can see Bret wearing a shirt with the rejected gift idea, the cross-stitch of Sally, from episode 5.
Bret McKenzie played a Rivendell Elf in both the Lord of the Rings and Hobbit series. So, in " Frodo, don't wear the ring" he is actually paying homage to a movie series he was personally involved with.
Images of Murray's wife features Rhys Darby's actual wife, Rosie Carnahan-Darby.