Plot hole: This series is in the same continuity as the other Marvel animated series that aired around the same time - X-Men, Spider-Man, Iron Man and Fantastic Four - by virtue of each aforementioned show crossing over with at least one of the other shows. However, the origin of the Leader in this show is inconsistent with his origin in Iron Man. In the Iron Man episode "Hulk Buster," which originally aired on February 10, 1996, Samuel Sterns became the Leader after a barrel of gamma waste fell over and spilled its contents onto him. In this show, which didn't air its first episode until September 8, 1996, Samuel Sterns became the Leader after he sabotaged Bruce Banner's gamma bomb test and fell into a pit of radioactive waste caused by the bomb. Rick Jones' role in Banner being exposed to the gamma bomb is different as well. In Iron Man, he parks his jeep in the test area and casually plays a harmonica. Here, he is riding his motorcycle through the test area and crashes, and is unable to restart his motorcycle in order to get clear of the blast.
Character mistake: Throughout the series, General Ross refers to Gabe Jones as Gabriel. Someone of Ross' military credentials would not address another government agent by their first name. He would call him Agent Jones or simply Jones.
The Return of the Beast: Part 1 - S1-E1
Factual error: When the Hulk jumps up and grabs on to the tail of the helicopter, he is somehow able to hang on to the tail while spinning the helicopter in a circle. Helicopters require a certain weight distribution in order to maintain stabilized flight. Someone of the Hulk's size and strength wouldn't be able to just hang on to the tail and spin the helicopter. He instead would bring the helicopter crashing down.
The Return of the Beast: Part 1 - S1-E1
Continuity mistake: When Banner is strapped to the chair and trying to resist transforming into the Hulk, the extent to how much he has transformed varies. Some shots will show his hands and head becoming larger, and the next shot will show him to instantly be back to normal proportions.
The Return of the Beast: Part 1 - S1-E1
Other mistake: When Talbot is grilling Banner for his relationship with Betty, when Banner is saying "Someone like you perhaps," the screen briefly constricts and then expands back to normal size, similar to a window on a computer screen being maximized.
The Return of the Beast: Part 1 - S1-E1
Continuity mistake: When General Ross is warning Banner that he is not bulletproof, an armed guard is flanked on either side of Banner. When the shot changes, the guard on Banner's left had suddenly moved several feet away.
The Return of the Beast: Part 1 - S1-E1
Continuity mistake: When Rick is telling his boss that he needs to leave work to help out a friend in a jam, he is standing next to the payphone, and when the shot changes, he is already several feet away sitting on his motorcycle and putting his helmet on.
The Return of the Beast: Part 1 - S1-E1
Audio problem: When Rick answers the payphone, his mouth isn't moving when he says "Ed's Garage."
The Return of the Beast: Part 1 - S1-E1
Continuity mistake: When the Hulk is trapped inside the containment unit and Betty calms him down, once he has reverted back to Bruce Banner, his hair is shown being blonde instead of brown.
The Return of the Beast: Part 1 - S1-E1
Audio problem: When the soldier is telling Talbot what Banner is doing with the power station, the soldier's mouth and jaw areas are not moving when his back is towards the camera.
The Return of the Beast: Part 1 - S1-E1
Continuity mistake: When General Ross is talking to Betty about the danger the Hulk presents to the world, the distance between them differs depending on the shot. One shot shows them standing close enough to hug each other, the next shot shows them instantly at arms' length apart.
The Return of the Beast: Part 2 - S1-E2
Continuity mistake: When the Leader is preparing to force Banner to transform into the Hulk, he shoots Gargoyle in the left shoulder with a blaster for being insolent, which leaves a hole in the corresponding area of his clothing. Moments later, the hole has disappeared.
The Return of the Beast: Part 2 - S1-E2
Other mistake: After the Abomination abducts Bruce Banner from the cavern, he causes a complete cave-in at the entrance. When Rick and Betty come to, they are able to see perfectly fine despite the sun being completely blocked out. Rick even states when he and Betty start to remove all the rocks that are blocking the opening that they need to find some blue sky before they can find Bruce.
The Return of the Beast: Part 2 - S1-E2
Continuity mistake: When Betty and Rick are attacked by the giant scorpion, the other mutated desert creatures appear perched on the humvee from out of nowhere.
The Return of the Beast: Part 2 - S1-E2
Factual error: When Betty's humvee breaks down in the middle of the desert, she gets out and steps over a scorpion. The scorpion is shown to have 10 legs (4 standard legs and 2 pincers). Scorpions have 8 legs.
Suggested correction: A scorpion's pedipalps (their pincers) are not legs. Scorpions and other arachnids have 8 legs and 2 pedipalps.
The Return of the Beast: Part 2 - S1-E2
Continuity mistake: When Thunderbolt Ross is talking about cutting a star out of the Hulk's hide, he is leaning against what remains of a wall after a hole was torn through it. When the shot changes to the Leader watching Ross through his insect drone, the section of the wall that was directly in front of Ross is now missing.
The Return of the Beast: Part 2 - S1-E2
Continuity mistake: When the Hulk is fighting the army helicopters in the desert, the color of the sky and the position of the sun indicate that it is twilight. When the Hulk takes cover in the canyon, the sun is setting at an unrealistically rapid pace. It transitions from twilight to nighttime faster than the helicopters can travel a quarter mile.
The Return of the Beast: Part 2 - S1-E2
Continuity mistake: When Talbot asks Betty why she is always helping the Hulk, they are standing next to a pipeline. When the shot changes, they have instantly moved several feet away from it.
Other mistake: When the Hulk takes down the S.H.I.E.L.D. helicopter, it is shown crashing to the ground with its pilot parachuting to the ground shortly after. However, the pilot was never seen ejecting and the helicopter's cockpit door was still closed when it crashed to the ground.
