It's a good video, and quite amusing, especially when the lawyer shouts at the audience not to answer the policeman's questions.
It's been posted and discussed on this forum before and it's been pointed out that the same right to remain silent doesn't necessarily exist in the UK or other countries as it does in the US.
But as a general principle it is always better not to say anything much in any sort of situation and to wait and see what the other person says instead. Not just with police, or with elders, but anyone. Listening carefully is always a better strategy than talking too much.