The Affair - S1-E4
Continuity mistake: When Matlock is talking to Harriet and Christina Harrison Ward after his attempt at re-enacting an alternative route for the murderer, Christina defends herself, saying, "But I was asleep." Matlock answers in the reverse shot, and you can see her pose with a hand in front of her chest that wasn't raised a moment before. (00:18:30)
The Affair - S1-E4
Continuity mistake: Tyler makes his exit from the bar, switching the power off; Kene Holiday pulls the lever down, and you can see him in the darkness go past the man by him and push the door open with a clean way out. In the shot from the exterior, though, he still has to push the man out of the door and goes around him, coming out by the side of the lock instead of the hinges. (00:20:40)
The Affair - S1-E4
Continuity mistake: At the Latino bar, Matlock begins playing pool to look cool with the local gang crowd - it is just as believable as it sounds. The positions of the billiard balls keep changing between shots. (00:30:00)
The Affair - S1-E4
Continuity mistake: When Matlock talks to Sonia after the attempt on Rodriguez's life, Theresa Saldana plays with the wedding ring in different ways as the different angles alternate. (00:33:20)
Continuity mistake: When Professor Tate congratulates Eric Lane for the improved grades, the two have a playful banter, and Tate says he's "happy to be proven wrong." Christopher McDonald has to wipe off some streamers that got in his hair. In the next close-up, he still has streamers on his shoulder despite the fact he brushed them away entirely. A similar mistake happens later on when he is carrying the unconscious professor out of the room; streamers suddenly are all over him from one shot to the next. (00:02:40)
Continuity mistake: When Billings offers Prof. Erskine Tate a nightcap, the confetti on his shoulder changes position and quantity in the close-up on Daniel Davis. (00:03:15)
Continuity mistake: Matlock is inside a jail cell, speaking to a man who has been accused of murder. In an outdoor scene, someone throws a raw egg at the window as Matlock looks out. Inside the cell, as Matlock turns away from the window, the splattered egg has vanished.
The Good Boy - S4-E3
Continuity mistake: When Cal Ritter's wife comes to his furniture studio to talk with him, the clock shows the time as 4:45. After they talk for two minutes, the security guard enters and says, "It's 5:00 and my ride's here. I just want to let you know I'm leaving."
Continuity mistake: Julia's hands go from being on her accomplice/boyfriend's cheeks to around his neck, then back to his cheeks in one shot.
Continuity mistake: Michelle Thomas, Ben Matlock's assistant, has been abducted and is being kept in the home of mobster Jay Cutler. Ben attempts to scale the wall surrounding the property. A close-up shows him with both arms resting atop the wall. In the very next shot, his arms are extended, his right leg is over the wall and he is raising his left leg.
Answer: I did not see this episode, but YES. Both prosecution and defense lawyers use investigators to search for and uncover evidence that is legally admissible.