When Ron is dancing around on ice-skates, there is a Gibson SG (the red guitar) on the stage. It has a "devil in a schoolboy uniform" image on the headstock, meaning it is an Angus Young signature issue. That particular model of the custom version of the '67 SG was released by Gibson around 2000.
Brick states "I ain't 'fraida no ghost", and is smiling and winking when he does it, so he is clearly seen to be referencing the theme song from Ghostbusters. Anchorman 2 is set in 1980, yet Ghostbusters was not released until 1984.
When Ron and Veronica are running on the beach, there is a see-through full-battened windsurfing sail in the background. These were introduced in around 1988. In 1980, the sail would have been triangular and opaque (same as sailboat sails).
Ron is told by his doctor: "Looks as if both optic nerves are separated from their respective corneas .... No other way to put this, but you're blind". The optic nerve does not attach to the cornea, therefore a separation of the two is a normal finding and would not result in blindness. If the optic nerve separates from the retina, on the other hand, blindness ensues.
The Ghost of General Stonewall Jackson speaks with a Deep Southern (perhaps Mississippi) accent, but Thomas Jonathan Jackson was from West Virginia & Virginia and would have spoken with a central Appalachian accent.
An important element of Ron's character is that he can only read exactly what is on the teleprompter, but he starts his first broadcast with "Hello America" but the teleprompter has "Good evening America" on it.
The news headlines running at the bottom of the screen during Ron's broadcast do not run in real time - they pause for many seconds during cuts then continue again when cutting back to Ron broadcasting.