Other mistake: Quinn is watching the video of the basketball returning from the vortex. The video shows him catching the basketball, then we see a shot of Quinn pressing the fast-forward button until he shows the basketball to the camera and says "and the crowd goes crazy!" The problem is that even though he pressed only the fast-forward button, the video fast-forwards from a point before the basketball came out of the vortex, which is impossible since Quinn never rewound the tape.
Other mistake: Quinn's alarm clock turns on, then about 8 seconds later we see the time change from 7:59 to 8:00. All clock radios turn on when the time changes, or possibly fade in slowly a few minutes before the alarm time, not a few seconds before.
Other mistake: Rembrandt is being tried in the People's Court. When he is sworn in, the bailiff ends the oath with "so help you God?" In this Earth alternative, the US is under Communist rule. There is no way God would be a part of an oath.
The Good, The Bad, And The Wealthy - S2-E4
Other mistake: When Rembrandt is playing poker for the first time, the guy across from him says he'll call (and then he raises). So Rembrandt folds (even though he had a full house) because that's what Priscilla told him to do. But Rembrandt was supposed to just ante and fold until Cliff got there. But because the guy called, that means Rembrandt made the first bet. He shouldn't have bet at all though.
Other mistake: 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. (00:31:25)
Suggested correction: You just explained the plot that Max explained to the group. Time is moving forward to the people of that world but moving backwards for them. So the anti-clockwise movement of the hands show time moving backwards while the reverse order of the numbers shows time moving forward.
Other mistake: 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.
The Return of Maggie Beckett - S5-E9
Other mistake: The group slides to Fresno, where there is a monument to Maggie Beckett and the astronauts that were lost on an Intrepid mission to Mars. On the memorial stone, her name is misspelled as Maggie Becket, not Beckett as everywhere else.