When George and Herschel have beers and talk, in some shots the six-pack container has three beers on one side and one on the other, while in other shots there are two on each side.
Meemaw is holding a SNES controller. A SNES (Super NES, Super Nintendo) is a 16-bit console, but the box and episode title both say 8-bit (like the NES, Nintendo Entertainment System).
This episode and season make references to the year being 1990. Sheldon and Meemaw can be seen holding a controller for a Super Nintendo/Super Famicom. That console wasn't released until 1991.