Episode #3.2 - S3-E2
Continuity mistake: When Humphrey asks Camille to "do that thing" he "rather enjoyed last time", Sara Martins has her right arm on the desk in the close-ups but she drops it in her lap in the wider angle. (00:42:45)
Episode #3.2 - S3-E2
Continuity mistake: At the beginning of the denouement, the hand of Michelle Ryan goes randomly off the table in her close-up, being on it the rest of the time. (00:43:10)
Episode #3.2 - S3-E2
Continuity mistake: Humph brags about how he discovered about the affair from a cup of tea; in a wide shot of the whole room he then says "Which is also how I figured out..."; in the background, walking left to right is the same man in cream tank and black bandanna that was already doing the same as an extra earlier in the reveal scene ("It was all a deception, of course") and vanishes in the next shot. (00:43:25 - 00:44:25)
Episode #3.2 - S3-E2
Continuity mistake: When Humph says."was the intended victim all along", a walking extra in a grey hat quickly pops in view, and disappears in the next shot. He appears again walking in the same direction a couple cuts later, when Dwayne hunches over the trunk (which would be far behind the first point we saw him at). (00:45:00)
Episode #3.3 - S3-E3
Continuity mistake: Inspecting the crime scene, Camille is looking through the victim's extensive wardrobe and wonders how he could afford all those designer clothes. Dwayne says "Good question. Come."; Camille has her right hand on the edge of the armoire door, but at the next shot it is her left hand, with the right on the other panel of the sliding door. (00:07:45)
Episode #3.3 - S3-E3
Continuity mistake: The "E" that Humphry attaches to the whiteboard on a post it note changes design between shots. (00:14:30)
Episode #3.3 - S3-E3
Continuity mistake: When listing the size of Saint Marie, the road is dry. When the shot changes to outside, the road is wet. (00:21:40)
Episode #3.3 - S3-E3
Continuity mistake: When Humphry is reciting the size of Saint Marie, look in the wing mirror to see a trail of vehicle behind the 4x4. When the 4x4 is passing a camera on the side of the road, the trail of vehicles has disappeared. (00:21:40)
Episode #3.3 - S3-E3
Continuity mistake: When Goodman and Bordey return to the police station after interviewing the Dragon Lady, the Defender's hood is fully in the sun as the Commissioner greets them, half in the shadow when they parked. (00:34:10)
Episode #3.3 - S3-E3
Continuity mistake: A very disappointed Commissioner Selwyn Patterson walks away from the station' stairs and its resident goats. Dwayne then shows the firearm register's entry, but he does it with his left hand, right hand with a really odd flourish, and left again between shots. (00:35:00)
Episode #3.4 - S3-E4
Continuity mistake: At the beginning of the episode, when Natasha Thiebert walks away from the table, she walks past the colleague in a loud blue and red shirt (Max). In the close-up when she looks back at the table though, Max passes her by again. (00:00:50)
Episode #3.4 - S3-E4
Continuity mistake: Camille tests how hard it is to reach the room keys (answer; it is very easy). In close-up the key to 276 is unperturbed and with the actual key to the right of the rock, but in the wide shot the key is to the opposite side of the stone fob. (00:07:55)
Episode #3.4 - S3-E4
Continuity mistake: At the concierge during the first interview, the phone rings. Simone asks "May I?" pointing with her left hand, which becomes the right hand after the cut. (00:09:00)
Episode #3.4 - S3-E4
Continuity mistake: Summing up the lack of progress in the case in front of the whiteboard, Humphrey points at Bevans' picture with his right hand at first in the overhead shot, which becomes the left hand at the cut. (00:25:30)
Episode #3.4 - S3-E4
Continuity mistake: When Humphrey foolishly lets Catherine pick the dish for dinner, he lifts the menu and only the menu off the table, but in the following shot he has one of the blue paper towels underneath it. (00:27:30)
Episode #3.4 - S3-E4
Continuity mistake: When Catherine brings the casserole of deadly confit de poulet, Humph unfolds the paper towel in the first shot but it's still perfectly folded in the next. (00:28:10)
Episode #3.4 - S3-E4
Continuity mistake: Dwayne is reading the local newspaper when Camille and Humph get back from the hotel. The paper folds in opposite directions in the two separate shots. (00:36:40)
Episode #3.4 - S3-E4
Continuity mistake: The hands on the close-up of the phone record sheet are inconsistent with the wider angle (Goodman's left hand should be in frame). (00:37:10)
Episode #3.4 - S3-E4
Continuity mistake: When Goodman crawls to get the poison vial, it contains just a bit of liquid left at the bottom. Later when he checks it out at the station in greater detail and many close-ups, it's over half full. (00:40:40)
Episode #3.4 - S3-E4
Continuity mistake: During the denouement, Helen Walker's hair goes from still to windblown and back suddenly between cuts multiple times. (00:45:00)
Answer: There's probably no particular reason. Sets and props on long-running TV shows often change as needed and for various reasons throughout a series run.
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