How Queer Everything Is Today! - S1-E10
Factual error: Kate fires a grappling hook into the back of the runaway train - it punctures the thin back door easily. She then fires another one backwards which hooks against one of the sleepers on the tracks. The slack gets taken up...and the train jolts to a dead stop as the hooks bite, (with everyone just wobbling on their feet somehow). No way on earth that's possible - the back door would have been torn off/open like a tin can and/or the sleeper would have been yanked out out of the ground, and the train would have ploughed into the station at full speed. Not to mention the fact that only after the train stops does the sleeper apparently give up the ghost and break. The magical supermetal of the train door is somehow still intact.