LUKE: So I got a Yellow Pages and I found the Big and Tall Casket Shop in Hartford.
The Yellow Pages are phone books which are for businesses, as opposed to the residential White Pages. They were originally printed on yellow paper, and came about in 1883 in Cheyenne, Wyoming, when a printer ran out of white paper and had to use yellow instead. The name and concept are now used globally.
In real life, Hartford does not have a Big and Tall Casket Shop, although it is certainly possible to order extra-large caskets for large people (or medium size people who want to be buried with all their worldly goods).
The Annotated Gilmore Girls 