The Emmy winner earned rave reviews for her performance in Talley's Folly, but not from one audience member – who happened to have originated her role.
Joost was supposed to represent The Netherlands, but was removed from this year's contest on the morning of the live final amid an investigation into an "incident".
The Trying star is the son of fellow actor Timothy Spall.
The Queen's Gambit star previously claimed she'd "never been more alone than making that movie".
The Thor actor has starred in eight Marvel films since 2011 and is still miffed that his heroes, including Francis Ford Coppola, have openly dismissed the genre.
Fans have mixed feelings over the upcoming series, which is set in the same universe as The Office.
"I'm going to be processing things for a long time," the Dizzy singer explained.