When Sheldon is in Georgie's room talking to Ms. Hutchins, a Texas license plate is visible over his shoulder, tacked to the wall. That style of plate, with the space shuttle in the upper left corner, was first introduced in Feb 2000, but the episode takes place in 1991.
As Sheldon walks out of the kitchen with Mary saying something to him, a box of General Mills Tiny Toast cereal can be seen to the lower right of her, behind a cooking pot. Tiny Toast wasn't introduced until 2016 and the episode takes place in 1991.
Ms. Hutchins is telling a story about losing a friend and says she misses "them". The show is set in 1991 and they did not use sex-neutral pronouns back then. Men were "him" and women were "her" and that is what she would have said.