United Kingdom, Jan. 13 -- The Duffer Brothers started filming the Stranger Things finale before they had finished the script because they were so "low on time".

Matt and Ross Duffer brought their hit Netflix series to an end after five seasons with a feature-length final episode - Chapter Eight: The Rightside Up - and the siblings have now revealed they were under huge amounts of pressure to get the shoot finished so the story was "plotted out" but the script hadn't been finalised.

In new documentary One Last Adventure: The Making of Stranger Things 5, Matt explained: "It's not like we don't know what the ending is. It's all plotted out. I have to write it, and we're just low on time."

Production assistant Montana Maniscalco was later...