In A Second Prodigy and the Hottest Tips for Pouty Lips (2021), a mishap with her sewing machine meant that Mary had to have an emergency haircut after having been cut loose from the machine by George. However, in this episode, her hair is exactly the same as always.
If a supercollider (or more aptly, a particle accelerator) were to create a microscopic black hole, it could swallow the Earth but not the moon. After ingesting all of Earth's matter, the gravity of the Black Hole would be the same as Earth's gravity formerly used to be. The moon and its orbit would therefore remain unaffected by the entire process.
At the end of the episode, Dr Sturgis is stacking cans at the grocery store display and knocks them over. The sound of the cans falling on the floor is that of empty cans.