When i view my heroku logs on the server (with heroku logs --tail --app myapp) i see something like this:
heroku logs --tail --app myapp
2011-06-21T14:09:25+00:00 app[web.1]:
In your production.rb add config.log_level = :debug and redeploy. That will give you the same logs as development mode :)
config.log_level = :debug