A Sour Note - S2-E2
Factual error: Gino commits a murder using a six-shooter with a silencer attached, and his shot doesn't make any noise. But it should have. Though it's a long-standing Hollywood cliché, a revolver with a silencer wouldn't be silent at all. Unlike automatic weapons, revolvers are open-chambered, which allows sound to escape. They can't be muffled with a silencer. (00:34:00)
The Baranoff Timetable - S2-E21
Continuity mistake: Ortega takes Mundy's shoes (with lock picks hidden in the heels) and locks him up. Mundy soon has the confiscated shoes back on again, though, even before he escapes the cell. (00:40:00)
A Thief is a Thief (a.k.a. Magnificent Thief) - S1-E1
Continuity mistake: When Mundy and Claire are sitting in the car outside the apartment building, the rear view mirror has disappeared (probably removed to prevent it from obscuring the actors' faces). It mysteriously reappears later on. (00:42:45)
It Takes One to Know One - S1-E2
Continuity mistake: When Al leaves the casino floor to call Noah, he's smoking a cigarette. When he reaches into his jacket for the wallets he's just stolen, the cigarette disappears. (00:05:30)
A Sour Note - S2-E2
Continuity mistake: During his scuffle with Gino, Mundy's hair is messed up, then neatly combs itself, then is messy again, and so on several times between takes. (00:45:45)
Hans Across the Border (1) - S2-E7
Visible crew/equipment: The shiny black side of Noah's limo shows us a very nice reflection of several members of the camera crew. (00:32:15)
Revealing mistake: Lori Chan picks Mundy up at the airport and proceeds to speed through town, spinning the steering wheel left, right and left again repeatedly. But the rear-screen projection behind them is showing footage from a car moving steadily in a straight line. (00:07:45)
To Catch a Roaring Lion - S2-E12
Continuity mistake: The professor translates the two Chinese symbols from Mundy's brass rubbing. Then he's shown a Chinese business card, and states that the 12 symbols on the card say the same thing. But not one of the symbols on the card matches the first two from the paper. (00:24:25)
Guess Who's Coming to Rio? - S2-E13
Audio problem: When Katrina walks out of the building at the end and crosses the street to Dover's car, the sound of her boots on the pavement doesn't match the actual movement of her feet at all. (00:45:10)
A Thief is a Thief (a.k.a. Magnificent Thief) - S1-E1
Continuity mistake: When the airline pilot enters first class to announce the baggage search, we see only 7 seated passengers and many empty seats. When the angle reverses, there are instantly 15 people seated, and almost no empty places. (00:25:30)
When Good Friends Get Together - S1-E9
Continuity mistake: Mundy lines up six golf balls and hits one, leaving five - until the shot reverses angles, anyway. Then there are only three golf balls left on the ground. (00:40:00)
It Takes One to Know One - S1-E2
Revealing mistake: During the crown jewel heist, Mundy is lowered through the ceiling on a trapeze. But the stunt double is apparent in long shots. He's taller and quite a bit more muscular than Mundy is. (00:36:00)
Get Me to the Revolution on Time - S2-E5
Continuity mistake: At the party, Mundy is handed a cocktail that's blue in color. Next shot, when he starts to drink it, the cocktail has changed colors - from blue to amber. (00:07:05)
Continuity mistake: Mundy shoots a palace guard with a tranquilizer dart, and the man falls unconscious on the stairs. When his fellow guards find him moments later, the unconscious man has somehow moved off the stairs and is now lying in the corridor. (00:39:15)
Beyond a Treasonable Doubt - S3-E23
Revealing mistake: Somehow you'd think that a gadget-happy government spy agency would be capable of replacing a dead battery. The clock in the SIA HQ board room remains at 10:10 throughout the entire 5-minute interrogation scene with Mundy. (00:07:00)
The Second Time Around - S3-E11
Factual error: Wally's car phone operates just fine - without the huge exterior antenna it would have required in 1969. (00:12:50)
Visible crew/equipment: When Colonel Parviz shoots at Mundy and breaks the mirror, the camera can be seen briefly in the glass, at the mirror's extreme right edge. (00:42:45)
Plot hole: While Mundy is trying to disarm the briefcase bomb in the study, his time-sensitive work is interrupted no less than 6 times by people barging in from the party out front. The plot device adds comic relief, but there's no earthly reason why he couldn't have locked or barricaded the door in the first place. (00:36:00)
The Family - S2-E23
Continuity mistake: In the opening scene, Mundy is tapping into a line by climbing a phone pole. He's starting back down when the shot cuts to a wider angle - at which point he's back at the top and starts down the pole all over again. (00:00:55)