When the vortex is created (to enter) it is often shown sucking things into it (usually for plot purposes) yet it is also often shown blowing their hair, debris, etc. away before they jump/slide.
During the Season 4 credits, Charlie O'Connell's name briefly extends past his face and into the shot of the four Sliders running in the fog.
The professor frequently calls people a "blistering idiot". The phrase should be "blithering idiot", in order words, someone who speaks nonsense. Of course, this could just be a character mistake.