Time Machine - List of Files that were backed up
The command tmutil compare lets you compare file lists if you don't want to do it using ls or other commands that can show differences in files and folders like rsync and many graphical diff programs.

You can list backup paths and then copy them into the compare command. Example:

sudo tmutil listbackups
sudo tmutil compare "path1" "path2"


Many people adore BackupLoupe as well. It makes a powerful database of what files are included with each backup interval.