This episode contains two mentions to Dennis and Tommy's friend "Joey." This could be a reference to Joey McDonald, who filled the role of Dennis' pal in five early episodes of the series before that role was shifted to Tommy Anderson. Despite his departure, he was mentioned a few times in the second season and then possibly again in this episode, but not seen.
The title is a publishing term where a first edition is from the first printing of a book and much more valuable than future editions. Book collectors prize the first edition of a book especially of they are exceptionally rare and valuable.