Continuity mistake: Season 5, episode 7, "Hide and Seek": Whenever Raven tries to contact Robin and Beast Boy answers the com, the background on the com's screen always shows daylight even when Raven calls up at nighttime.
Other mistake: Among the Titans groaning over Beast Boy's "brainfreeze" joke, we see XL Terrestrial, the pale-turquoise alien-looking guy with two antennae who can grow to large size. Again a mix-up of hero and villain identities, since XL was in the H.I.V.E. and the Brotherhood of Evil and should therefore not be among the young heroes. You will also see the Puppet King by Jericho.
Other mistake: When Red Star introduces himself, he takes off his parka with both hands. But as it drops to the ground, you can see the fingertips of his hands on top of the screen, standing completely still. This setup looks unnatural, as if he had suddenly taken off the parka with some telekinetic power.
Continuity mistake: Kyd Wyykyd gets overpowered by Jinx and is frozen along with his compatriots lying in a heap. But later on, when the Titans inspect their flash-frozen trophies after the battle, Kyd Wykkyd suddenly stands all alone by himself (top shelf, far right).
Character mistake: Another identity mistake in the finale: When Beast Boy's team is initially subdued, we see honorary Titan Hot Spot standing amongst the villains even though he is a) a hero and b) is supposed to be frozen solid at that time.
Continuity mistake: When Kid Flash and Jinx arrive to give a helping hand, the remaining H.I.V.E. Fivers stare at her, aghast about seeing her on the heroes' side; Billy Numerous even points at her. Before (when Cyborg is slammed into the stairs) and after (when Kid Flash races off into the fray) that particular shot, however, the H.I.V.E. Fivers' stances and expressions just remain the same.
Lightspeed - S5-E8
Continuity mistake: When the HIVE Five corner Kid Flash in the museum, See-More activates his laser eye, which is red. But one cut later, when Jinx walks up saying "you're a little slow", his eye has its standard vision coloring again. And before the commercial break See-More puts his left hand to the visor switch, but after that he has his right hand up.
Factual error: 5-2 "Homecoming Part 2": The key Madame Rouge forms with her finger to open the handcuffs in the introductionary flashback scene is a key for a cylinder lock. But the handcuffs' keyhole is styled to accept a bit key.
Continuity mistake: In the shot immediately after Beast Boy says "Uh guys, I think they're know we're here", where the lizard men are entering the scene, Starfire is in her normal sleeveless outfit. In the shot immediately before and after this, she's wearing a full suit of Tamaranian armour. (00:18:05)
Continuity mistake: In the scenes where Mas sticks out his tongue at Cinderblock and when he starts feeling around for Menos at the Brotherhood's base, the plus sign on his left ear and chest, respectively, are painted black instead of white.
Continuity mistake: Más y Menos figure out how to use Professor Chang's Cryogenic Machine to unfreeze their fellow Titans and do the reverse with the opposition. But the few times where they are seen actually activating the Freeze option - Professor Chang and his assistants, and later the HIVE Five -, they push a different button in each instance.
Plot hole: Speedy's bow got cut up by Cheshire in the previous episode ("Calling All Titans"), and in the Brotherhood base he is seen frozen with empty hands raised. But when he is unfrozen in this episode (zoom in to check), he suddenly does hold a new bow in his hands.
Plot hole: When the raptors bring down Beast Boy in his Tyrannosaurus form, he escapes the batch lying atop of him by turning into a dragonfly. When he does so, the heap of dinosaur bodies does not sag down at all, and to fill out the gaps, a whole lot of additional raptors appear in his stead from God-knows-where.
Continuity mistake: When Gnarrk attacks Dr. Light's amplification machine, the wrench Cyborg threw at him has suddenly grown in length. At first his fist encloses the whole grip, but a minute later it is long enough to be used as a club.
Lightspeed - S5-E8
Continuity mistake: When Kid Flash intercepts Gizmo's shop-lifting, Gizmo was walking towards the exit with his shopping cart. But after Kid Flash has deposited Gizmo in the cart, he pushes it on towards what would be the back of the shop, away from the entrance. But then Gizmo bursts out of the entrance into the parking lot beyond.
Continuity mistake: Pantha, mistaking Cyborg for a competitor, grabs him, lifts him over her head and begins spinning him. In the shot where she is briefly seen from above, she uses only one hand, but before and after that she uses both hands to whirl him around.
Continuity mistake: When Raven is ambushed by Kyd Wykkyd and Psimon, she looks at Psimon over her right shoulder (since Kyd Wykkyd sits on the canopy in front of her). But when we see the outside of the pod, Psimon hovers in the air to the left side of the pod; he even casts a glance over his right-hand shoulder, i.e. to Raven's own left side, while she keeps looking to the right.
Lightspeed - S5-E8
Deliberate mistake: In the museum, Kyd Wykkyd creates a teleport hole whose diameter is smaller than the length of the cobra staff he intends to snatch. In fact, when he takes it out of the showcase, the lower part of the staff passes right through the glass.
Deliberate mistake: Kitten and Fang's limousine is rather quite broad, as we can see when Red X pops in. But since he is using both hands to cut the car in two, he'd have to extend the natural length of his arms in order to use both X-sawblades at the same time.
Chosen answer: It is located in California, as shown in "Teen Titans: Trouble in Tokyo". Possibly San Francisco as seen in the comics.
MasterOfAll