The name tag which Larry is given to wear at the testimonial, and which he makes such an issue about, is not the same one he wears for the remainder of the event. He is given one written in lower case, but it changes to one in capitals.
Marty Funkhouser gives a speech at his father's testimonial (Leo Funkhouser) and mentions that his mother can't be there because she "passed away ten years ago". Then, in The Ida Funkhouser Roadside Memorial (2007) the whole plot of the episode is that Marty Funkhouser's mother has just recently died (she was in a wheelchair and got ran over by a car). How could his mother have died ten years ago in Season 4, yet she just died (again) in Season 6?