George is essentially selling off 100% of the station in the form of stock, since $75,000 is what his Uncle valued the station at. All R.J. would need to do is send intermediaries over to the station to quietly buy a controlling interest and he could shut the station down anyway, and save some money besides. Being the cutthroat businessman that he is, he should have realized this immediately.
In the scene where R.J. Fletcher meets Harvey Bilchik at the airport to close the business deal R.J. puts the briefcase on the back end of the limo but when the limo drives off the briefcase is nowhere to be found and is assumed that R.J is holding it in the next shot.
On a TV commerical for "Conan the Librarian" the time that it says the program comes on is 7:30pm. A few scenes later George is setting up the Fall UHF line up on a magnetic board - and you can see on the board that Stanley Spudosky's Club House comes on every day of the week from 7:00pm to 8:00pm.
When Stanley Spadowski is tied up in the broom closet and realizes his beloved mop is in the room with the thugs, he has an orange bandana around his neck. When he breaks free of his ropes and jumps out of the broom closet, the bandana disappears.
When the video of R.J.'s rant is played back by Philo ("This community means about as much to me..." etc.), R.J.'s phrasing at the beginning of the rant doesn't match when he's originally heard saying it earlier in the film.
In the opening moments, a bad guy draws a gun with his left hand to shoot Weird Al in the back. Weird Al suddenly wheels around, takes his whip, and severs the bad guy's arm. The next scene shows the bad guy's right arm lying on the ground.
In the Indiana Jones scene, as Al runs out of where the Oscar statue was, there's a yellow diamond road sign to the left of the opening that says "Watch For Falling Rocks", yet when he was walking in earlier, that section was clearly visible and the sign wasn't there. Also, all the barricades and other traffic signs Indy passed on the way in have disappeared when he leaves (this may have been intentional).
In the Rambo sequence, George catches the entire .45 cartridge with his teeth. When a cartridge is fired, only the bullet portion is propelled. The shell is either ejected (as would be with the semi-automatic .45 1911) or kept in the cylinder (if it were a revolver).