Revealing: When the nude lady closes the door, look closely - you can see the edge of her pink bra right under the bar.

Deliberate "mistake": When Quinn comes back to the hotel room with a large stack of money he'd won at the casino, he waves it, and you can see a 1-dollar bill in the middle. He was supposed to have over $100,000, but since the crew couldn't get that much money for a brief scene, they used a stack of dollar bills.

Other: The Sliders discover the reverse-time issue when they notice that the clock on the wall is backward. However, in other shots, clocks look normal. Look carefully at the clocks on the judge's desk as the camera pans by.

Other: According to reverse-time issue: In court, when Quinn looks at the clock on the wall, you can see that the clock still goes forward, despite of the anticlockwise indicators since the digits are inverted.

Deliberate "mistake": If time is, in fact, going backward, then people would be walking backward, all sound would be backward, etc.