I mentioned this one in another thread but if ever there was a Las Vegas movie scene you would want to be a part of, it would be in this movie: X The Man With The X Ray Eyes. The Las Vegas scenes begin at about 58 minutes after the start of the movie. Watch it on YouTube below.
If you're under 40 you probably don't realize how great this movie was back in its day, and it still is.
I love the shots of travelling to LV along the I-15. The very same road sign with the mileage to Vegas and Salt Lake City is there (Im sure they updated the sign) and you can see the long stretch down the hill to Stateline Primm without seeing the casinos at Primm.