Continuity mistake: At the end, while Hogan and Klink are talking, Hogan's right arm alternates between being up with a note in hand to down at his side between shots.
Revealing mistake: While talking about Von Baler's daughter, Hogan is facing the building talking with Carter and Newkirk. Behind him is an open area of the camp. If you look, you can see that there is no guard in The Tower, no shadow of The Tower of the guard hut (the sun is behind them and Hogan), and the snow is piled up about three feet behind Hogan, suggesting that the background is a wall mural in the studio.
Watch the Trains Go By - S4-E19
Visible crew/equipment: As Carter and Newkirk are caught by the wire, the shadow of the camera pulling back is seen on the ground.
Watch the Trains Go By - S4-E19
Continuity mistake: As Schultz is by the car, Hogan is behind the fire brigade equipment. When Klink calls Schultz, Hogan gets up from behind the equipment. A second later, in a closeup, he comes up from behind the equipment again.
Watch the Trains Go By - S4-E19
Visible crew/equipment: As Schultz stops the car, studio equipment is reflected in the windows.
Watch the Trains Go By - S4-E19
Visible crew/equipment: As Linkmeyer and Klink get in the car, a man in a white shirt can be seen moving around the camera position in the reflection on the car under her window.
Watch the Trains Go By - S4-E19
Visible crew/equipment: When Klink is by the fence acting busy and talking to Schultz, twice you can see the shadow of the camera on Klink's overcoat.
Factual error: When the farmer sticks his pitchfork into the haystack, a scream is heard, but then everybody emerges unscathed. Wounds from pitchforks aren't like sitting on a brass tack - even a quick jab usually earns you a trip to the surgeon (I've seen such wounds), a vigorous stab like the one in the scene would go through limbs and could easily kill a man. There's no way anybody would walk away from such a hit.
Revealing mistake: When Schultz is on the way out after giving the guys the news about the inspections and roll calls, you can plainly see that the background behind him is a matte painting. This is easy to spot because the building in the distance is lighter in color, and there are ripples in the fabric used.
Continuity mistake: Col Hogan eats Col Klink's chicken leg and places it back on the plate with meat still on the bone. When Col Klink picks up the chicken leg after, there is no meat on the bone. It's stripped bare. (00:01:00 - 00:03:00)
Continuity mistake: When Helga brings in Klink's dinner and sits it down, Klink takes off his monocle. In the close up, it's on and his hands are folded, then he points to a chess piece, contemplating a move. In the wide shot, he's holding his monocle, and puts it on.
Continuity mistake: When Hogan drinks Klink's wine, he picks up the glass with his right hand and his left arm is behind him. A second later, Hogan's left hand is in front of his chest.
Other mistake: In the tunnel where the prisoners are storing ammunition. Col Hogan tells his men the next one that lights a cigarette gets a court martial. The tunnel is lit by open flames. (00:06:00)
Continuity mistake: Carter and Hogan are in Klink's outer office when Hogan takes a piece of paper off Carter and folds it into a square. Klink arrives and grabs the paper which has now unfolded to a rectangle. (00:09:10)
Continuity mistake: After the prisoners have loaded the truck, they stand around and the tailgate of the truck is down. Major Hochstetter arrives and we see the tailgate is raised. Next scene it is again in the lowered position. (00:17:40)
The Witness - S4-E23
Revealing mistake: As Schultz comes in the barracks door, there is a sliver of the studio background visible by the door jamb above his head.
The Witness - S4-E23
Continuity mistake: In the beginning, the guys are listening in on Klink's office. The cup in front of Newkirk has four pencils in it. The colors from left to right are yellow, red, blue, and orange. After the camera cuts to Hogan and Kinch, the wide shot shows five pencils arranged yellow, black, blue, red, and orange.
Visible crew/equipment: As the two German officers come out of Klink's office and approach the radar truck after Kinch leaves, the shadow of the cameraman, the camera, and the camera tripod are plainly visible on the left side of the scene on the ground.
Visible crew/equipment: When the radar truck comes into the camp, as it slows, you can see the lighting rigs for the cameras.
Suggested correction: Considering they have a tailor (Newkirk) and are air dropped everything from explosives to penicillin, a Class A dress uniform would hardly be a challenge to make or receive.
stiiggy
Klink: "Hogan, where did you get that uniform?!" - Hogan: "Oh, I had OSS airdrop it together with our latest shipment of explosives and ammunition. We brought it in through our tunnel last night and stored it there."
Doc ★
I got it from the Red Cross.
stiiggy
Only a few high ranking intelligence officers are aware of Hogan's mission. Hogan's activities would under normal circumstances be considered fraternisation. While it might be true that he could theoretically obtain a class A uniform via the red cross, doing so would brand him as a collaborator and traitor.
Doc ★