Continuity mistake: When Stu and Glen are about to meet Fran and Harold, Glen gets up out of a hammock to go and see them. When it cuts to a shot of Stu rushing to meet them, in the background behind Stu, you see Glen getting out of the hammock again.
Suggested correction: Glen at 1st sits up. Then he gets off the hammock.
I just rewatched that scene, and Glen does fully get up and out of that hammock twice.