Those Are Strings, Pinocchio - S3-E22
Continuity mistake: During the graduation Lorelai borrows Richard's pen and writes "we got the inn" on the graduation program, and when she holds the program up to show Rory note the position of the blue logo printed on the bottom page. First the logo is near the center crease, but then it's at the outer edge of the page. (00:35:20)
Those Are Strings, Pinocchio - S3-E22
Visible crew/equipment: When Lorelai, Sookie, and Jackson are "celebrating" they all sit down at the table, and we can see the T-mark on the floor behind Jackson. (00:11:30)
Chosen answer: Lorelai and Christopher get married impulsively in Paris but they get divorced shortly after returning home. I don't know the exact number of days or weeks but they definitely weren't married for more than a couple of months.