Ralph is not wearing his glasses when he takes off his fencing helmet, but in the very next shot they suddenly appear on his face.
When the photographer is about to take pictures of Ralph and the stenographer, his lens cap is not on the camera. In the next shot, the lens cap is on, and the detective makes him remove it.
In the shot showing the bed collapsing, you can see a piece of rope tied to the foot of the bed, and watch it get pulled, causing the collapse.
When the swimming instructor jumps in the water, you can see the shadow of the cameraman in the foreground.