Curly's smile disappears after the shot of him beginning to sleep.
The shot of Curly spraying pickle juice at Mrs. Catsby is shown too late.
Curly ended up suffering first-degree burns in the scene when Moe and Larry are thawing him over a roasting fire. He got burned by the actual fire before crew members could pull him off.
When the Stooges rush out of the gas station with their equipment, the three professors in the car mysteriously have their lunch laid out.
After Moe finishes singing "B-a-bay-be-e-b", he closes his mouth, but you can still hear him singing.
After the lunchman says "Luncheon is served", the a shadow of the boom mic is moving about at the top left corner of the screen.
Although they know him as Professor Von Stupid, a chorus of girls sings "Curly's a dope."