I've seen this movie several times and the first time I saw it when young, picked up on the "goof" then forgot what movie I saw it in. Tonight I was reminded.

This movie shot in 1956 depicts a repaired U.S. carrier re-joining the pacific fleet near the end of the war in 1945. It is heavily damaged but makes it back to port where the crew receive a huge celebration of their return including a large Navy band. As the band is playing at the end of the movie a brand new 1956 Chevrolet Bel-Air makes it way across the screen in clear view.

I read up a little on this show and some goofs were mentioned but not the large obvious goof at the end.