The saloon Bret visits was originally the set for Rick's Cafe from Casablanca (1942). This statement appears to refer to the flat used as the exterior facade and entrance, as the interior set bears no resemblance to Rick's in Casablanca, and is in fact the same saloon/cantina set used in many other episodes.
(Wilhelm Scream): When Bret is attacked in the alley and throws the last bad guy through the window.