If there are scenes in the movie that need to be filmed on waterways or rivers, the filmmakers are advised to plan for them well ahead of time. This entails working with the film contact in order to secure permission for filming.
Early consultation is necessary because there are typically very particular rules that apply for specific waterways and rivers. The preparations that need to be made could be plentiful, which is why handling them as soon as possible would be best.
It is also important to discuss filming inside public transport with the film contact beforehand. Notably, shooting a scene where someone is drinking alcohol or even perceived to be drinking alcohol is not allowed on several modes of public transportation.