When Quinn and Chandler play chess, Chandler has Quinn play as white. But when Mac and the Sliders watch the two play on Mac's monitor, you can clearly see Quinn playing as black.
When Mac approaches the Sliders at the end of the episode, the timer switches between Quinn's left and right hand.
When Mac is picking out a battle outfit for Maggie on his device, flak jacket is misspelled as "flack jacket".
When the Sliders check into the hotel, they are given a double sided paper. On one side is the schedule, on the other side are the rules. At the bar, Quinn reads aloud the hotel rules. However, the rules side is facing the camera while he's doing this, so he's actually looking at the schedule side.
In the suite at the Chandler Hotel, Quinn opens the window curtain to reveal a brick wall, and yet another window immediately behind the rest of the Sliders has sunshine illuminating the curtains.