Did you spot the body double??
This is one of my favorite movies of all time and saw it in theater when it originally came out. I have probably watched the movie over 50 times. In the bowling alley scene. Frank Sinatra is seen throwing a strike and the camera is located behind the bowling pins. If you look closely Frank is not throwing the bowling ball. It is a double. This was most likely done because Frank might not have been a good bowler and they wanted to get the shot over with it.
The movie is fascinating because it shows what the Las Vegas Strip looked like in 1960. I lived in Las Vegas for many years first coming to the town in the mid-seventies. East and West Flamingo were mostly desert in 1960. Caesars Palace wasn't even built yet. There was very little going South past the Dunes onto the route that eventually took you to Los Angeles. I-15 freeway didn't exist yet. Las Vegas was really a small town. You would see the visitors to the casinos dressed up just like in the movie. Men in suits and women smartly attired. There is sign on the Strip selling land past the Dunes when Sammy Davis Jr was driving his garbage truck out of town. If you had bought that land on the Strip. You would be an extremely wealthy man today. I can't even guess the price of an acre back then.