These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Warehouse 13
Accidental Innuendo: Pete invites Claudia, Myka, and Leena to watch movies with him in his room and mentions his big flat screen TV. He also happens to be in his pajamas.
Averted in the escape from Warehouse 2 with a handwave. Even though Myka finds the wings of Daedalus and Pete makes a good argument, it's plainly clear that having Pete piggyback ride on Myka's back would look... interesting.
Complete Monster: The evil personality of Artie created by the astrolabe seems to be shaping up to be this, after ruthlessly killing Leena simply because she was in his way and unleashing a plague on the world.
"Running Up That Hill (Deal With God) by Track and Field, during the scene where we discover that Steve is really working for the Warehouse, and is subsequently killed by Sykes for no good reason at all.
Foe Yay: Artie and MacPherson. It really seems like this in "Mild Mannered" when MacPherson's ghost is haunting Artie and they reconcile with one another.
Fridge Logic: In the finale episode of season 3, why didn't HG just put the force field around the bomb when it was clearly stated it can contain the blast?
One of the producers said on Twitter that H.G. couldn't have known if the force field would hold when it was directly over the bomb. When you think of it that way, a blast that big in that confined of an area probably wouldn't be a good idea.
Indeed, it stands to reason and simple physics that containing the blast would have been more taxing on the shield and rapidly used up the power, whist allowing the blast to dissipate outwards (destroying the Warehouse in the process) would have meant less of the explosion would have been directed towards those within the shield, keeping it running for long enough for them to survive.
Idiot Ball: Pete in "The Sky's The Limit". After being whammied by the levitation artefact that has caused several victims to be killed when thrown into the upper atmosphere a short time later, Pete only figures it's a good idea to stay inside or with a roof over his head after Artie suggests it.
Idiot Plot: One wonders how much trouble the gang would have avoided if they didn't have the staggeringly stupid tendency of separating all the time, often in the worst possible moments, and ignoring obvious warnings. Plus being taken out by civilians in ordinary hand-to-hand when they're supposed to be secret service.
Les Yay: Between Myka and HG Wells. Pete even comments that it's like having two Mykas around. Confirmed by the actresses that they were playing it a little bit like they 'were in love'.
Word Of God is that the Christmas Episode is set out of sequence, between "Merge With Caution" and "Vendetta." (Though one wonders where all that snow went so fast...)
No doubt the Christmas Episode was simply delayed to air during Christmas season, anyway.
The jury is obviously still out on this, but Aaron Ashmore has been hired to play Myka's replacement in Season 3. Whether or not it takes, though, is obviously up in the air for now.
In the first episode of season 3, she comes back at the end, after helping out with the investigation which just happens to feature a Myka Plot Tailored to the Party. Looks like Jinks is staying for a while at least maybe.
Ok, Syfy. You killed Artie in the first season finale, but you brought him back to life with the Phoenix. You sent Myka away in the second season finale, but you arranged for her to come back in the next episode. Now you are asking us to believe that you killed an agent, HG Wells, and Mrs. Frederic, and in addition destroyed the very thing that the show is named after? Sorry, but we don't buy it.
Paranoia Fuel: Is that classic book you're reading fiction, or is it inspired by a very real and very evil person that lived at the time?
And this could even lead to possible Fridge Horror and What an Idiot moments when one considers how some of these artifacts were used. Obviously, P.T. Barnum really was a total Jerkass and in it for the money when he used an artifact (that could enlarge body parts and internal organs) to make freaks out of normal people...
Though considering we see how (some) artifacts are created, it may be that in some cases, even the horrific ones, the use of them was unintentional and un (or sub) conscious. So jerkasses they might have been but they might not have been so callous as to mistreat others.
Squick: In "Vendetta," a set of chains used in the people-stretching racks employed by the Spanish Inquisition has the power to replicate those effects when stretched taut. The viewer gets treated to a surprisingly graphic scene where Dickinson is killed with it, complete with bone-cracking noises as his fingers and legs contort to unnatural angles.
Ship Sinking: Usually about once a season or so the show makes a point to remind us that Pete and Myka have no romantic interest in each other whatsoever.
Ship Tease: Pete subconsciously wants Myka to have his babies.
What an Idiot: H.G. Wells asks about MacPherson's necklace, and he tells her that it's keeping him alive.
What Do You Mean, It Wasn't Made on Drugs?: Played with using Timothy Leary's reading glasses, which cause vivid, LSD-like hallucinations when worn. They were used to find MacPherson's hidden auction of Warehouse artifacts in the first season finale. In "For the Team", Pete uses them to amuse himself when forced into a temporary desk job at the Warehouse.
The Woobie: Pete in "Trial" after his memory gets erased. When Myka is about to confront Eric's mother, you just want to hug him and make him feel better.
The Untwist: Yeah, Jinks is a traitor. Okay. Sure. We believe you.