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: 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)
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.