Other mistake: In the Regal Beagle, Jack addresses Marsha as Ms. White although later in the episode her last name is revealed to be Whitewood. In addition, how could Jack have known her last name anyway? Marsha only said her first name in front of Furley and the trio early in the episode and presumably she hasn't talked to the trio since she left with Furley out the door.
Suggested correction: In addition to the other correction (occurring 00:07:25), this correction addresses the second part of the mistake, as to how Jack knew Marsha's last name. Earlier, when Larry tells the trio that Furley was fine with him being late with the rent, Janet states, "He's been wining and dining her for 3 days" (at 00:06:15). So at any time during those 3 days (offscreen), Furley told the kids about his dream girl, which would have included her last name.
Suggested correction: No Jack does say, "Hello Ms. Whitewood!" While they are shaking hands. Time stamp in the episode when this occurs is at 7:25.
Part 1 Roots: The Saga of An American Family - S1-E1
Other mistake: During the voyage aboard the Lord Ligonier, none of the African captives have shaved nor had haircuts during the long voyage across the sea, but they are clean-shaven and their hair the same length when they berth in Annapolis as when they were first loaded aboard ship in Africa.
Other mistake: As corvette guy races to get away from Ponch, the steering wheel breaks away, coming loose in his grip. Yet the car magically veers a sharp left before halting to a stop, instead crashing into the trees straight ahead of him.
Other mistake: When the throne in episode 5 & 6 is first introduced it is a normal throne or chair; it doesn't move when merely touched. But once the ceremony starts and after it's finished, it's suddenly a swivel chair. The base is never shown of course. But a swivel chair made of solid rock...?
Other mistake: When Bodie, Julie and Myer reach the vicarage, an editing blunder seems to show the door opening twice.