I think the DC logo appeared.
The show had 2 different openings. When Monty took over, the opening was trimmed slightly, and the part that was cut was in parenthesis. It went something like this
"Behind these everchanging doors lies an array of prizes and surprises. From MGM Studios in Orlando Florida, people from all over have come to play America's greatest game (It's big, it's bold, it's the one and only) Let's Make a Deal.
Intro for Bob Hilton: And now, here's your host, the man with money in his pocket and a twinkle in his eye... BOB HILTON!
Intro for Monty: And now, here's our special guest host, the big dealer himself, MONTY HALL!
The video wall was basically another concealer of a prize or zonk, not unlike the 3 doors or the box on the display floor, that's it.