Retro City Games, a store mentioned on the end credits roll, was on "Valle Verde" road at the time the movie was shot. This is misspelled as "Valle Verd."
For many of interviewees, one of the captions describing accomplishments says "Has Twin Galaxies Card." But in at least one instance, this is misspelled as "Has Twin Galaxy Card."
On the commentary, Jay and Rob believe that a claymation commercial featuring Yoshi and related characters is for Yoshi's Island, a Super Nintendo platformer. Based on the fact that the commercial features stacked enemies sandwiched between Yoshi egg shells, the commercial is more likely for the came simply called Yoshi, for the NES, which was a puzzle game that used this mechanic.
One of the rules for Jay's quest is that he cannot use friends for the journey. Yet the first thing he does it goes to the houses of several friends; it seems like this would be a violation of the rules.