When I bought an HD TV and a Blu-Ray player, I bought the Blu-Ray version of the movie Bullitt.
I already had the DVD, and knowing the film was over 40 years old, I didn't expect a noticable difference in the Blu-ray version. I was dead wrong. For the first time I noticed that the 68 Charger was bright blue underneath all that black paint. For the first time I could identify almost every car in even the most distant background. And I had never before noticed the spent shell casings bouncing off the pavement when the passenger in the Charger was shooting at McQueen in the Mustang. What a difference!!!