I've only used Premiere Pro CS6 for a week so I'm fairly new to it. I just completed editing my first video but when I tried exporting it, the video didn't show all the clips I used in my sequence and/or had extra clips that I did not use.
This screeshot says that this video is 2 minutes 15 seconds long. Ok good. That's how long I needed it to be.
BUT HERE. The file says its only 1 minute and 4 seconds long and once I scrolled through it, I saw that it didn't have all the clips I used and instead inserted itself clips I DIDN'T use. This is a fan video so I used a large file as a source and used the input-output to grab clips and edit and added music and transitions. That's it.