Continuity mistake: In the 1st 5 or 6 seasons the inspector introduces himself as Thomas S Brackenreid. Later he becomes Thomas C Brackenreid.
The Annoying Red Planet - S1-E13
Factual error: Golf balls did not have inverted dimples until 1905, the exterior covers were dark, rougher and probably with an interior of wood. The white golf balls used by Murdock to illustrate a point had not been invented at that time.
Revealing mistake: Near the end of the episode, when Dr. Ogden and Murdoch look closely at Lukas' dead body (right before the candle scene), the "corpse" takes a deep breath.
Murdoch.com - S2-E10
Factual error: Enid, the telegraph operator, exclaims that "He is sending an SOS." However, in the 19th century, distress calls did not include the letters "SOS," It was not until the early 20th Century that SOS was chosen as the international distress call.
Continuity mistake: At the end of the previous episode Murdoch has a ring with a dark blue stone, but at the start of this episode he takes out the box and the ring has a dark red stone.
Factual error: In the opening scene when the men in orange sashes are greeting each other, you can briefly see one of the men in an orange sash wearing what are quite obviously modern sunglasses. Even if the glasses were meant to be from the period, sunglasses were not mass-produced or widely available until the late 1920's.
Continuity mistake: The snake that bites - and therefore kills - Prof. Greenwood (and which is later found by Crabtree and Higgins) has nothing to do with the one Dr. Bajjali puts on her shoulders or the one Dr. Grace dissects later on, despite they are supposed to be the very same snake. The first one is seemingly a King cobra, while the other one resembles a Python (which is not even venomous). The visual difference is totally obvious.
Stroll on the Wild Side part 2 - S5-E8
Revealing mistake: Towards the end of the episode, when Murdoch attacks Falcone, look closely: the first punch - which knocks the mob boss down - looks convincing but the second time Murdoch "hits" him, he punches nothing but the ground. Falcone is facing right while the detective strikes his left side, at least an inch away from his head.
Murdoch Night in Canada - S5-E12
Other mistake: Murdoch sends Crabtree to buy six pumpkins, but when they test how tall the murderer might be, there are much more pumpkins can be seen.
Murdoch Ahoy - S7-E1
Continuity mistake: Amy was just rescued from a flooding hold, but when she's being helped onto the life boat her dress and hair are completely dry.
Glory Days - S8-E3
Continuity mistake: Towards the end of the episode, during the final shootout, Murdoch ambushes an armed bad guy in the attic and jumps through the wooden wall with him. As they fall down, Murdoch's trademark hat spectacularly flies off his head, but in the next overhead cut - showing him and the bad guy lying on the ground - the hat is on his head again.
Murdoch and the Temple of Death - S8-E10
Continuity mistake: When Murdoch and Dr. Bajjali reach the grail chamber, the detective tosses a coin on the pedestal to see if it's trapped. The coin triggers the firetrap and falls to the ground. Murdoch then throws another coin which ends up resting on top of the pedestal, next to the fake grail. Now, when the detective removes the pedestal cover, there is a quick cut when both coins can be seen on the top of it, despite that the first one is supposed to lie on the ground.
Continuity mistake: Shortly after arriving to the crime scene, Murdoch instructs Crabtree to collect the fingerprints of the asylum patients - but the women in the institute were arrested before (most of them by Murdoch himself) so their fingerprints should've been collected already. It's pointless collecting them again.
Character mistake: It's more than unlikely that a prison guard would leave a suspected murderer (George) alone with anyone, especially a woman (Edna) for minutes. (00:24:28)
Character mistake: When first discussing the projectile Murdoch has written on his board that 2 (sin45) =1. This is obviously incorrect to anyone who's studied even basic trigonometry. (00:05:54)
Other mistake: James Pendrick shares his plans with Murdoch about how he is going to reach the orbit of the Earth by flying his own built rocket. However, earlier in the episode, Pendrick himself reveals that he is claustrophobic (extreme fear of confined places). Having such phobia would make his planned journey fundamentally impossible as he couldn't stay hermetically closed in the small rocket for long without suffering serious psychical damage.
Other mistake: Pendrick states that the rocket barrel is 70 metres long (deep). Despite that, Murdoch reaches the bottom in mere seconds, has enough light to see around and is even able to hear the others outside.
Bend It Like Brackenreid - S10-E7
Continuity mistake: At the beginning of the episode, some of the main characters are spectating the ongoing football match. Look at Dr. Ogden: the position of her hands - therefore the way she is holding her bag - keep changing cut by cut.
Home for the Holidays - S11-E1
Other mistake: Only one set of prints were said to be on the garrote but in the last episode of season 10 Graham handles the garrote before handing it over to the murderer without wearing gloves. So there should have been 2 sets of prints.
Continuity mistake: After the failed attempt to stop Mr. Dilbert's bleeding, the ambulance attendant collects and takes away all the bloody rags they used for hemostasis. Still, the very next cut shows a whole pile of rags on Mr. Dilbert's body. To make the mistake even more evident, both his shirt and these rags are all clean with no blood on them. (00:42:35)
Suggested correction: The show is set in the early 1900's, which is the early 20th century. By the time this event transpired, SOS would have been established as a universal distress signal.
The show starts in 1895 and by season 2, it was still the 19th century and before Germany adopted SOS in 1905.
Bishop73