Man to Man, Beast to Beast - S1-E6
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 portrayal of Sasquatch between this show and X-Men is not consistent. In X-Men, Sasquatch was a mutant and longtime member of Alpha Flight, under the purview of the Canadian government. In this show, Walter Langkowski is a hermit that had only recently become Sasquatch through a gamma experiment gone wrong, and he chooses to exile himself into solitude by episode's end.
Man to Man, Beast to Beast - S1-E6
Other mistake: When Gabriel Jones talks with General Ross, his fingernails are perfectly visible, even though he is wearing gloves.
Man to Man, Beast to Beast - S1-E6
Continuity mistake: When Dr. Langkowski presses the play button on Banner's tape recorder, he is pressing on the right side of it. When the shot changes, the buttons are now on the left side of the recorder.
Man to Man, Beast to Beast - S1-E6
Deliberate mistake: When Bruce Banner is crawling away from the town that Hulk attacked, he passes out in the snow and is rescued by Sasquatch/Walter Langkowski. When he awakens in Langkowski's lab, he is wearing his usual outfit. Since he was only wearing tattered pants when he passed out, that means his clothes were given to him by Langkowski, which is extremely unlikely since the two hadn't seen each other in a long time and Langkowski didn't even know Bruce was looking for him.
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.
Man to Man, Beast to Beast - S1-E6
Continuity mistake: When Taylor discovers Sasquatch's footprints in the snow, they have no toe prints. When Taylor's father finds the same footprints, they now have toe prints.
Man to Man, Beast to Beast - S1-E6
Revealing mistake: When Hulk uppercuts Sasquatch into the ice wall, if you look closely you can see that Hulk's fist doesn't even make contact with Sasquatch.
Man to Man, Beast to Beast - S1-E6
Continuity mistake: When Dr. Langkowski is talking about solving the mystery of gamma mutation in humans, a couple pens appear in his shirt pocket.
Man to Man, Beast to Beast - S1-E6
Factual error: Hulk rescues Taylor from the icy waters, but Taylor shows no signs of hypothermia afterwards. He should be shivering profusely. Hulk naively tries to cuddle the boy and blow on him, but even if that had the ability to warm him up a little, his wet clothes would still be an issue.
Man to Man, Beast to Beast - S1-E6
Other mistake: When Banner snatches the tape recorder out of Langkowski's hands, the recorder stops playing without Banner pressing any of the buttons.
Answer: The Hulk is a giant brute who smashes everything in his path when he is angry. In Ang Lee's "Hulk," General Ross, played by Sam Elliot, explains it to his daughter.