Helping Hands, Iron Fist - S1-E4
Continuity mistake: After Rick Jones finds Bruce Banner among the overpass wreckage, Bruce starts transforming into the Hulk and grabs some gray rubble, which immediately turns the same color as his flesh.
Continuity mistake: When Bruce and She-Hulk are hitchhiking, the sign for New York behind them changes size and lettering. When it is first shown, it is significantly taller than both of them with the lettering reading "NeW York" (sic) in a thin and long font type. When the shot changes, the sign is much shorter and the lettering now reads as "NEW York" in a more block-lettering style.
Helping Hands, Iron Fist - S1-E4
Continuity mistake: When Doc Samson is carrying the cylindrical tank for the nutrient bath, he is holding it from the bottom rim. When the shot changes, he is holding it from the outside.
Factual error: When Hulk lands on top of Mount Rushmore, Teddy Roosevelt's glasses are missing.
Man to Man, Beast to Beast - S1-E6
Continuity mistake: When Dr. Langkowski climbs into the large test tube to run the experiment on himself and Banner, he uses a hatch wheel to seal his tube closed. When the shot changes, the wheel has disappeared.
Continuity mistake: When Bruce Banner is in the soup kitchen, there are several paneled windows behind him. When he is shown standing up from his seat, it is only a brick wall behind him.
Continuity mistake: When Doc Samson throws Hulk through the train station, it is a wooden building. When Hulk crashes out of the back side, it is now a brick building.
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.
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
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
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 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
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 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.
