By Harry Davies Footage from Conor McGregor’s acting debut in the remake of Road House has shown him headbutting Jake Gyllenhaal in an action scene. UFC legend McGregor is appearing in a remake of the 1989 classic alongside Hollywood star Gyllenhaal. The film will be released on March 21 and its first trailer has now appeared online with footage from some of McGregor’s scenes. One clip shows McGregor, who plays Knox, storm into a bar and say “Hey fellas, looks like you’re having a smashing night! Dalton, I’ve got a tip for you. Don’t let no-one get this close.” Gyllenhaal, who plays Dalton, is…