Continuity mistake: When Murdoch returns to the shed in the last scene, Emily is there too, but in the last two shots, she disappears.
Fergus Breaks the Rules - S7-E18
Revealing mistake: A wire is under Fergus when he arrives at the smelter's.
Fergus Breaks the Rules - S7-E18
Continuity mistake: When Fergus runs away, his taillamp is on his right side. When he hides in the siding, his lamp is on the left side.
Revealing mistake: When Toby tells the Fat Controller about the broken windmill, his driver's head appears to have been digitally added.
Visible crew/equipment: A crew member is visible on the left side of the screen when Skarloey notices the hot air balloon is about to crash.
Snow Engine - S7-E14
Other mistake: Before Oliver crashes, no-one appears to be inside his cab in a shot of him passing a crossing.
Deliberate mistake: When Thomas goes by the level crossing, a close up of Thomas is shown but it's the same footage from season 1, only flipped. Because of this, Thomas' number is mirrored.
Visible crew/equipment: When the banner hits Gordon, in the next shot, a scaffold is very visible in the trees on the right. (Visible in Wide screen version only).
Answer: Butch the breakdown truck must have pulled Gordon's tender all the way up the rails so the breakdown train can reach it and also Butch helped to get Gordon close to the winch.