Neil Patrick Harris: Glee Is Like "Factory Work"

The cast of Glee works hard -- perhaps a little too hard for Neil Patrick Harris.

The actor told Entertainment Weekly that working on the Fox show was a bit like being on an assembly line.

"It's a bit of factory work," he said. "Just a lot of 'Next take! Next take! Moving on! Moving on!"'

Harris said he had a blast guest-starring on Tuesday night's episode, directed by his Dr. Horrible's Sing-Along collaborator Joss Whedon. But he said the "wildly grueling" shoot took its toll -- on his first day he flubbed every one of his lines.

Harris also said hunky quarterback Finn Hudson (Cory Monteith) is "dreamy" and, hard work aside, he wouldn't rule out a return visit.