The two actors had very realistic on-screen romance, but in reality they couldn't stand each other.
Do you have one on-screen howler that springs to mind?
Tim, his government contact and the highest-ranking individual in the PMF, was already on screen when Brady entered the comms center.
Planning on-screen using a word-processor is possible, but it's a fairly advanced technique.
Raja was much more confident, which shows up on screen.
It contains a film of a complete Symbolic Modeling session with on-screen annotation.