At the end of the episode, just before Quinn slides, he talks to the kid Jamie Hardaway and puts the kid's cowboy hat back on his head, as he turns to head into the vortex in the same shot, the kid's hat blows off his head again. The next shot from the side as he leaves the kid to heads into the vortex, the kid's hat is back on his head again. The shot change is almost instantaneous, which reveals a common continuity error that was made.
At the end this episode, when the professor uses the timer to activate the wormhole, you can hear and see the wormhole in the background before the "light ray" appears out of the timer which is supposed to proceed before the wormhole appears.
Just before the final act starts, Quinn removes his holster and sits down on a bench. While he sits on the bench, he is suddenly wearing his holster again. When he gets up, the holster is back in his hands.