The episode takes place in 1999, but while at the mall, when the kids turn to watch Eddie at the perfume stand, in the background is an out-of-focus GameStop video game store. You can see their "Tax ReFUN Sale" sign through the glass window, and on the glass door is an out-of-focus green and purple Lego DC Super-Villains (2018) video game ad. That game didn't come out until 2018.