There is a bug report thread. (It may have been pushed to the second page.) Get a screenshot of the problem(s), and post it, along with any other details you can think of ... location, mission, anything that would help someone re-create the problem.
The number of bugs was certainly reduced in the last release, but there may still be more than a few. (Speaking of that, make sure you have the latest version. We're on 0.6.5 now.) Just post them as you find them. OnR is released with minimal testing ... player feedback is the only major mechanism for finding errors.