Agnes Skinner is on the cover of the Playdude that Bart is reading in the Bunker and it says she's "Miss Cold War"
During the sweep over the townspeople at the top of the show, Tom Petty appears as an angel, having just passed in October 2017.
Bart's chalkboard gag: Snow angels are not frozen hobos.
The show ZOOM, referred to by Sideshow Bob, aired on WGBH-2 out of Boston. It was a show done by kids for kids. The address given by Sideshow Bob is the same as the one they announced at the end of every show. Kids could write to that address, and if they included a SASE (self addressed stamped envelope), they could receive a ZOOM card. This had a picture of one of the show's cast on the front and some information about the show on the back (e.g., how to speak Ubbi Dubbi, a made up language featured on the show).
WILHELM SCREAM: Member of the search team trips over the grid (At around 5:00).