To see the most recent stash:
git stash show -p
To see an arbitrary stash:
git stash show -p stash@{1}
Also, I use git diff to compare the stash with any branch.
You can use:
git diff stash@{0} master
To see all changes compared to branch master.
Or You can use:
git diff --name-only stash@{0} master
To easy find only changed file names.