Looking inside a merge commit

$ git log --pretty=format:'%H: %s'
1cd2d7606bbb4b513c8a9460c24955a44ac85da5: HeliForce: fixed monster truck color variation as
a7b4c005498096c5b36d76c99ae694fb217dee1d: Added gaming ideas + improvements.
b13baf97a1fd7f8de3fffa2efa369fedf9d025de: Merge branch 'master' of ssh://localhost:2202/~rg
732b03941bdfdc6860bf557bab91eb7371f587b8:  - DRY'ed float_health,  - added monster trucks +
a8af0aa92c03120930241ed12739d474e2cfea9a: Made landings more velocity-dependant and also fi
...

Then diff from previous commit to merge commit:

git log -p 732b03941bdfdc6860bf557bab91eb7371f587b8..b13baf97a1fd7f8de3fffa2efa369fedf9d025de