"I have a giggling problem. I lost it several times and messed up takes. David Walliams was doing a cameo and I exploded mid-scene," Contactmusic quoted him, as saying.
Schwimmer particularly blamed Irish comedian Dylan Moran for most of his untimely laughter.
"Crap flew all over Dylan's face. I cried with laughter," he said.
Schwimmer is helming the Brit movie that stars Simon Pegg, Thandie Newton, Hank Azaria and Little Britain star David Walliams.